List Of Data Formats & File Extensions: Reference Guide

Last Updated August 2, 2022 7:25 am

Webopedia’s list of Data File Formats and File Extensions makes it easy to look through thousands of extensions and file formats to find what you need.

With literally thousands of data file formats employed by Windows and Window-based apps, keeping track of all the file extensions used by software applications and programs can be a challenge.

Webopedia’s List of Data File Formats and File Extensions

Fortunately, Webopedia’s Complete List of Data File Formats and File Extensions makes it quick and easy to sift through thousands of file extensions and data file formats to find exactly what you need. You can peruse the full list or search for data formats and file extensions based on the letter they start with from the table below.

Number Symbol A B C D E F G H I J K
L M N O P Q R S T U V W X Y Z Full List

Data File Formats and File Extensions – Complete List
.!bt	BitTorrent Incomplete Download file
.!qb	qBittorrent Partial Download file
.!ut	uTorrent Incomplete Download file
.#24	Printer data file for 24 pin matrix printer (LocoScript)
.#ib	Printer data file (LocoScript)
.#sc	Printer data file (LocoScript)
.#st	Standard mode printer definitions (LocoScript)
.$#!	Cryptext
.$$$	Temporary file
.$00	Pipe file (DOS)
.$01	Pipe file (DOS)
.$db	Temporary file (dBASE IV)
.$ed	Editor temporary file (MS C)
.$er	GroupWise Database
.$o1	Pipe file (DOS)
.$vm	Virtual manager temporary file (Windows 3.x)
.^^^	Pervasive.SQL Database file
.__a	File Splitter & Joiner Encrypted file
.__b	File Splitter & Joiner Encrypted Archive file
._dd	Norton Disk Doctor Recovered file
._eml	Windows Live Mail Email file
._nws	Windows Live Mail Newsgroup Copy file
._p	Malicious Software Removal Tool Temporary file
.~$~	Temporary file (1st Reader)
.~ap	Old AppExpert project database (Borland C++ 4.5)
.~de	Project backup (Borland C++ 4.5)
.~hm	HostMonitor TestList Backup file
.~mn	Menu backup (Norton Commander)
.{pb	Corel WordPerfect Document Index file
.201$201	Temporary file (1st Reader)

.000	Image Data Recovery file
	Compressed harddisk data (DoubleSpace)
.001	Norton Ghost Span file
	Multiple Volume Compressed file
	Fax (many)
.075	75×75 dpi display font (Ventura Publisher)
.085	85×85 dpi display font (Ventura Publisher)
.091	91×91 dpi display font (Ventura Publisher)
.096	96×96 dpi display font (Ventura Publisher)
.0b	Printer font with lineDraw extended character set (PageMaker)
.0xe	F-Secure Renamed Virus file
.1	Inno Setup Binary file
	Roff/nroff/troff/groff source for manual page (cawf2.zip)
.10	IBM Voice Type Script file
.113	Iomega Backup file
.123	Lotus 1-2-3 Spreadsheet file
.15u	Printer font with PI font set (PageMaker)
.1pe	TurboTax Form file
.1ph	TurboTax file
.1st	Usually README.1ST text
.2	Setup Factory 6.0 setup launcher
.264	Ripped Video Data file
.2d	2d Drawings (VersaCad)
.2da	2 Dimensional Data Array file
.2dl	2d Libraries (VersaCad)
.3d	3d Drawings (VersaCad)
.3dl	3d Libraries (VersaCad)
.3dv	3D VRML World
.301	Fax (Super FAX 2000 – Fax-Mail 96)
.386	Intel 80386 processor driver (Windows 3.x)
.3da	3D Assembly file
.3dd	ArcGlobe Document file
.3dr	3DMark Benchmark file
.3ds	Graphics (3D Studio)
.3dt	Database for 3D mind map / concept map (3D Topicscape)
.3fx	Effect (CorelChart)
.3g2	3GPP2 file format
.3gp	3GPP Multimedia file
.3gr	Data file (Windows Video Grabber)
.3ko	NGRAIN Mobilizer
.3me	TurboTax Form file
.3mm	3D Movie Maker Movie Project
.3pe	TurboTax 2008 Form file
.3t4	Binary file converter to ASCII (Util3)
.411	Sony Mavica Data file
.4c$	Datafile (4Cast/2)
.4dv	4D View Ultrasound file
.4mp	4-MP3 Database file
.4sw	4dos Swap File
.4th	Forth source code file (ForthCMP – LMI Forth)
.5cr	Preconfigured drivers for System 5cr and System 5cr Plus
.669	Music (8 channels) (The 669 Composer)
.6cm	Music (6 Channel Module) (Triton FastTracker)
.777	7-Zip compressed file archive
.7z	7-Zip archiving format
.8	A86 assembler source code file
.8b?	Adobe Photoshop Plugin file
.8ba	Adobe Photoshop Plugin file
.8bf	Adobe Photoshop Plugin file
.8bi	Adobe Photoshop Plugin file
.8cm	Music (8 Channel Module) (Triton FastTracker)
.8li	Photoshop Scripting Plug-in
.8m	Printer font with Math 8 extended character set (PageMaker)
.8pbs	Adobe Photoshop Macintosh file
.8u	Printer font with Roman 8 extended character set (PageMaker)

.a	Ada source code file
	Library (unix)
.a0?	ALZip Split Archive file
.a11	Graphics AIIM image file
.a2b	A2B Player Playlist
.a3d	Amapi 3D Modeling file
.a3m	Unpackaged Authorware MacIntosh file
.a3w	Unpackaged Authorware Windows file
.a4a	Authorware 4.x Library
.a4m	Unpackaged Authorware MacIntosh file
.a4p	Authorware file packaged without runtime
.a4w	Unpackaged Authorware Windows file
.a5w	Unpackaged Authorware Windows file
.aa	Audible Audio file
.aab	Macromedia Authorware Binary
.aac	Advanced Audio Coding MPEG-2, MPEG-4
.aam	Authorware shocked file
.aax	Audible Audiobook file
.ab2	Parson’s Address Book
.ab6	Datafile (ABStat)
.ab8	Datafile (ABStat)
.aba	Palm Address Book file
.abc	ActionScript Byte Code File
	ABC FLOWCHARTER 1.x flowchart
	ABC2K Audio/Video Controller Software
.abd	AmBiz Bonus Calculator data file
	Adventure Builder database
.abf	Adobe Binary Font
.abi	ABI CODER Encryption software
	AOL extension: AOL 6 Organizer
.abk	Automatic backup file (CorelDRAW)
.abm	ImagePals Photo Album Document
	Montage Photo Album file
	PhotoPlus Album file
.abr	Adobe Photoshop brush file
.abs	Abstracts (info file)
	Data file (Abscissa)
	MPEG audio sound file
.abw	AbiWord document
.abx	WordPerfect Address Book file
.aby	AOL file (located in AOL program directory)
.ac3	AC3 Audio File Format
.aca	Microsoft Agent Character file
	Project (Project Manager Workbench)
.acb	Graphics (ACMB)
.acc	Program (DR-DOS – ViewMax) (GEM / resident)
.acd	Sonic Foundry Acid music file
.ace	Ace Archiver / WinAce compressed file
.acf	Microsoft Agent Character file
	Adobe Photoshop Custom Filter
.aci	ACI Development Appraisal
.acl	Microsoft Office Auto Correction file
	Document file (Audit Command Language)
	ArborText Command Language
.acm	Audio Compression Manager Driver
	Photoshop command button
	Windows system file
	ACBM image file
	Interplay compressed Sound file
.acorn	ACORN Graphics format
.acs	MS Agent Character file
.acs2	AIMP2 Media Player Skin file
.acsm	Adobe Content Server Message file
.act	Actor source code file
	Foxdoc Action Diagrams (FoxPro)
	Presentation (Action!)
.acv	OS/2 Audio Drivers
	Photoshop Saved Curve
.ad	Screen saver data (AfterDark)
.ada	Ada source code file
.adb	Ada Package Body
.adc	Bitmap graphics (16 colors) (Scanstudio)
.ade	Microsoft Access Project
.adf	Adapter Description file
	Admin Config file
	Amiga Disk File
	Dog Creek QC Mask file
.adi	Graphics (AutoCAD)
.adl	Mca adapter description library (QEMM)
.adm	After Dark Screen Saver Module
	Windows Policy Template
	Addict Compiled Dictionary
	Administrative template files for protected mode in Internet Explorer 7.0
	Advantage Data Server Database Memo file
.adn	Add-in (Lotus 1-2-3)
.ado	Photoshop Duotone Options
	Stata Program
.adp	FaxWorks Modem setup file
	Astound Dynamite file
	MS Access Project
	AOLserver Dynamic Page file
.adr	Address Book
	Address Plus Database
	After Dark Random Screen Saver Module
	Opera Web Browser Bookmark file
	Smart Address Address Book
.ads	Ada Package Specification
.adt	Datafile for cardfile application (HP NewWave)
	Fax (AdTech)
.adx	Document (Archetype Designer)
.adz	GZ-Packed Amiga Disk file
.aeh	iPer Advanced Embedded Hypertext
.aep	Adobe After Effects Project file
.aex	PGP Armored Extracted Public Encryption Key
	After Effects Plugin file
.af2	Flowchart (ABC FlowCharter 2.0)
.aff	AnyForm Form file
.afi	Truevision bitmap graphics
.afl	Font file (for Allways) (Lotus 1-2-3)
.afm	Type 1 font metric ASCII data for font installer (ATM – many)
	Datafile for cardfile application (HP NewWave)
.afs	Adobe Type Manager font set
.aft	AnyForm template file
.ag	Applixware graphics file
.agp	Aspen Graphics Pages
.agw	Aspen Graphics Windows
.ai	Vector graphics (Adobe Illustrator)
.aiff	Audio interchange file format
.ain	Compressed file archive created by AIN
.aio	APL file transfer format file
.air	Adobe AIR Installation Package file
	Automatic Image Registration
.ais	Array of Intensity Samples graphics (Xerox)
.aix	Datafile for cardfile application (HP NewWave)
.ajp	JPEG2000 Digital closed-circuit television (CCTV) security camera video format
.alb	JASC Image Commander Album
	Photo Soap2 file
	Steinberg Cubase or VST Backup Song file
.albm	webAlbum Photo Album
	HP Photosmart Photo Printing Album
.all	Format file for working pages (Always)
	General printer information (WordPerfect for Win)
	Symbol and font files (Arts & Letters)
.als	Alias Image
	Calmira Shortcut file
.alt	Menu file (WordPerfect Library)
.alx	ActiveX Layout file
.alz	ALZip Compressed file
.amf	Music (Advanced Module Format)
.amff	Amiga Metafile
.amg	Compressed file archive created by AMGC
	System image file (Actor)
.amp	Photoshop Arbitrary Map Settings
.amr	Adaptive Multi-Rate ACELP Codec
	Above audio file extension
.amv	AMV Video file
.amx	After Effects Motion Exchange file
.anc	Animation file format (MorphInk)
.ani	Animation (Presidio – many)
.anm	Animation (Deluxe Paint Animator)
.ann	Help Annotations (Windows 3.x)
.ans	Ansi graphics (character animation)
	Ascii text ANSI character set (NewWave Write)
.aos	Add-On Software (Nokia 9000)
	ARCHOS 504 media
.ap	Compressed Amiga file archive created by WHAP
	Datafile (Datalex EntryPoint 90)
	Artwork Systems Program (ArtPro)
.apc	Printer driver (Lotus 1-2-3)
.apd	Printer driver (Lotus 1-2-3)
.ape	Music format (different players)
.apf	Printer driver (Lotus 1-2-3)
.api	Adobe Acrobat Plugin file
	Passed parameter file (1st Reader)
	Printer driver (Lotus 1-2-3)
.apk	Android Package file
.apl	APL work space format file
.apm	ArcPad 6 file
.app	Add-in application file (Symphony)
	Application object file (dBASE Application Generator)
	Executable application file (DR-DOS – NeXTstep – Atari)
	Generated application (FoxPro)
.apr	Employee performance review (Employee Appraiser)
.aps	MS Visual C++ file
	ArcPad 5 Symbology file
.apx	Appexpert database file (Borland C++ 4.5)
.arc	Compressed file archive created by ARC (arc602.exe/pk361.exe)
	Compressed file archive created by SQUASH (squash.arc)
.arf	Automatic Response file
.arg	AutoCAD Profile Export file
.ari	Compressed file archive created by ARI
.arj	Compressed file archive created by ARJ (arj241.exe)
.arl	AOL Organizer File
.ark	Arc file archive created by CP/M port of ARC file archiver
	Compressed file archive created by QUARK
.arr	Arrangement (Atari Cubase)
.ars	Adobe After Effects Render
.art	Graphics (scrapbook) (Art Import)
	Raster graphics (First Publisher)
.arv	Arsiv File
	AutoRoute User Information
.arx	Compressed file archive created by ARX
.asa	MS Visual InterDev file
	Active Server Document
.asc	Ascii text file
	Adobe ActionScript Communication file
	Transport armor file (PGP)
.ascx	Microsoft ASP.NET user control file
.asd	Autosave file (Word for Windows)
	Presentation (Astound)
	Screen driver (Lotus 1-2-3)
.asf	Datafile (STATGRAPHICS)
	Screen font (Lotus 1-2-3)
.ash	Assembly language header file (TASM 3.0)
.asi	Assembler include file (Turbo C – Borland C++)
.asl	Adobe Photoshop Layer file
.asm	Assembly source code file
	Pro/Engineer Assembly file
.asmx	Microsoft .NET Web Service file
.aso	Assembler object (object orientated) file (Turbo Assembler)
.asp	Microsoft Active Server Page
	Aspect source code file (Procomm Plus)
	Association of Shareware Professionals OMBUDSMN.ASP notice
.aspx	Microsoft ASP.NET file
.asr	Ms Automap Route
	Photoshop Scratch Area
.asx	Microsoft Windows Media Active Stream Redirector file
.asx	Microsoft Advanced Streaming Format
.at2	Auto template (Aldus Persuasion 2.0)
.atm	Adobe Type Manager data/info
.atn	Adobe Photoshop Action file
.atr	Lightscape Material Library
.att	AT&T Group 4 Bitmap
.aty	3D Topicscape (Exported association type)
.au	Sound (audio) file (SUN Microsystems)
.au3	Autoit3 script file
.aud	Audio file
.aut	AutoIt Script
	PocketWear Car Lease Kit vehicle data file
	TLG Workplace CD search file
	Xitami Webserver Admin Password file
	GPSMan-autoMapic file
	Signwave Auto-Illustrator file
	Descent Manager Mission file
	Authentication file (various)
	Interactive Pictures iPIX Format
.aux	Auxillary references (TeX/LaTeX)
	Auxiliary dictionary (ChiWriter)
.ava	Publication (Avagio)
.avb	Inoculan Anti-Virus virus infected file
	Microsoft Chat character file
.avd	Avery Label Pro Data file
.avi	Audio Video Interleaved animation file (Video for Windows)
.avr	Audio Visual Research file
.avs	Animation file
	Application Visualization System Format
	Stardent AVS-X image
	Winamp Advanced Visualization Studio file
.avx	ArcView file
.aw	Text file (HP AdvanceWrite)
	Answer Wizard for Microsoft Help
.awb	Lavasoft Ad-aware backup file
.awd	AWD MS Fax
	Award BIOS file
	AWK Language Source Code file
.awe	Adobe Acrobat Bookmark XML file
.awk	Awk script/program
.awm	Movie (Animation Works)
.awp	Microsoft Fax key viewer
.awr	Telsis Digital Audio file
.aws	Data (STATGRAPHICS)
.ax	DirectShow Filter
.axd	Avery Label Pro Re-Index file
	Actrix Technical file
.axe	Paradigm C++ Integrated Debugger file
	ChordMaster
	MS Autoroute export file
.axg	MS Autoroute Trip file
.axl	ArcIMS XML Project file
.axs	AMX Axcess control system file format
	HTML Active X script
.axt	ZenWorks snAPPshot ASCII Application Object template
	Photoshop Replace Color/Color Range
.axx	axxess files used as backups of Inter-Tel databases
.azw	Amazon Kindle eBook File
.azz	AZZ Cardfile

.b	Batch list (APPLAUSE)
.b&w	Black and white graphics (atari – mac)
.b~k	backup file
	Mono binary screen image (1st Reader)
.b00	CD Image Segment file
.b16	PCO Graphic file
.b1n	Both mono and color binary screen image (1st Reader)
.b1s	Booksmith
.b30	Printer font (JLaser – Cordata) (Ventura Publisher)
.b3d	3D Builder file
.b5i	Blindwrite 5 Disk Image file
.b5t	Blindwrite 5 Image Information file
.b6i	Blindwrite 6 Disk Image file
.b6t	Blindwrite 6 Image Information file
.b8	Raw graphics (one byte per pixel) plane two (PicLab)
.b_w	Black and white graphics (atari – mac)
.bad	Bad file (Oracle)
.bag	PMMail Mail Index file
	OS/2 Netfinity Manager Sysinfo file
	AOL Instant Messenger file
.backup	Ad-Aware Reference file
.bak	Backup file
.bal	Music score (Ballade)
.ban	Sierra Print Artist Banner
.bar	Horizontal bar menu object file (dBASE Application Generator)
.bas	Basic source code file
	Microsoft Visual Basic class module
.bat	Batch file (DOS)
.bb	Database backup (Papyrus)
.bba	Settler IV Archive file
.bbl	Bibliographic reference (TeX/BibTeX)
.bbm	Brush (Deluxe Paint)
.bbs	Bulletin Board System announce or text info file
.bc!	Bitcomet Incompleted Download file
.bcf	ConfigSafe Snapshot index
	Belarc Advisor Content File
	The Sims (Maxis) File
.bch	Batch process object file (dBASE Application Generator)
	Datafile (Datalex EntryPoint 90)
.bck	Backup
.bcm	MS Works Communications file
.bcn	Business Card Pro Design
.bco	Outline font description (Bitstream)
.bcp	Borland C++ makefile
.bct	Business Card Designer template
.bcw	Environment settings (Borland C++ 4.5)
.bde	Borland Database Engine
.bdf	Bitmap Distribution Format font file (X11)
	Datafile (Egret)
.bdm	AVCHD Index file
.bdmv	Blu-ray information file
.bdr	Border (MS Publisher)
.bez	Outline font description (Bitstream)
.bf2	Bradford 2 font
.bff	Binary file format
.bfm	Font metrics (unix/Frame)
.bfs	Tivoli Storage Manager file
.bfx	Fax (BitFax)
.bga	Bitmap graphics
.bgt	Quicken 2002 Internet Common File
.bgi	Borland Graphics Interface device driver
.bgl	Flight Simulator scenery file
.bgt	Quicken 2002 Internet Common File
.bib	Bibliography (ASCII)
	Database – not compatible with TeX format (Papyrus)
	Literature database (TeX/BibTeX)
.bic	Civilization III Scenario
.bid	BidMaker 2002 file
.bif	Binary Image Format b&w graphics (Image Capture board)
.bik	BioCharter Profile backup file
	Bink Game video file
.bin	Binary file
.bio	OS/2 BIOS
.bip	Free-motion capture files for character studio biped
.bit	Bitmap Image
	Worms Armageddon Imported Map
	Worms World Party Imported Map
.bk	Faxbook (JetFax)
.bk!	Document backup (WordPerfect for Win)
.bk1	Timed backup file for document window 1 (WordPerfect for Win)
.bk2	Timed backup file for document window 2 (WordPerfect for Win)
.bk3	Timed backup file for document window 3 (WordPerfect for Win)
.bk4	Timed backup file for document window 4 (WordPerfect for Win)
.bk5	Timed backup file for document window 5 (WordPerfect for Win)
.bk6	Timed backup file for document window 6 (WordPerfect for Win)
.bk7	Timed backup file for document window 7 (WordPerfect for Win)
.bk8	Timed backup file for document window 8 (WordPerfect for Win)
.bk9	Timed backup file for document window 9 (WordPerfect for Win)
.bkf	Microsoft Backup file
.bkg	Background file
	UWXAFS Binary Format Data file
.bkp	Backup file (Write – TurboVidion DialogDesigner)
.bkw	Mirror image of font set (FontEdit)
.blb	DreamWorks Resource Archive
.bld	Bloadable picture (BASIC)
.blend	Blender 3D file
.blf	Windows Registry Recovery file
	Bantec Scanner Driver file
.blg	Binary Performance Log File
.blk	Temporary file (WordPerfect for Win)
	Lightscape Block Library
	Alias Wavefront Image
	VersaPro Block
.blob	Steam Archive file
.blt	Saved AIM Buddy List file
	Wordperfect for DOS file
.bm	Bitmap graphics
.bmf	Corel Image file
.bmi	3ds max Executable
.bmk	Help Bookmarks (Windows 3.x)
.bmp	Bitmap graphics (PC Paintbrush – many)
.bmx	Buzz music file
.bnd	Typequick file
.bndl	Bundle file
.bnk	Adlib instrument bank file
.bob	BobDown Downloading Program
	Bob Raytracer
.bom	MicroSim PCBoard Bill of Materials
	Orcad Schematic Capture Bill of Materials file
	Softshare Delta Business Object Model
.boo	Compressed file ASCII archive created by BOO (msbooasm.arc)
.book	Adobe FrameMaker Book
	HTMLDOC document
.bot	Linkbot file
.box	Myriad Jukebox file
	Notes Mailbox
.bpc	Chart (Business Plan Toolkit)
.bpl	Delphi Library
.bpt	Bitmap fills file (CorelDRAW)
.bqy	BrioQuery file
.br	Script (Bridge)
.brd	Eagle Layout file
.brf	Braille ASCII file
.brk	Fax (Brooktrout Fax-Mail)
.brn	BornoSoft Bangla2000 (a Bengali word processor) File extension
.bro	Tree Professional Broadleaf Creator file
.brp	Tree Professional Broadleaf Creator image
.brt	Micrografx Picture Publisher file
.brx	Multimedia browsing index
.bsa	Compressed file archive created by BSARC
.bsb	MapInfo Sea Chart
	SWAT Sub-basin Output file
.bsc	Compressed Apple II file archive created by BINSCII
	Database (Source Browser)
	Pwbrmake object file (MS Fortran)
.bsdl	Boundary Scan Description Language
.bsl	BSPlayer Configuration file
.bsp	Half-life/TFC/CS Map
	Quake Map
.bst	BibTeX Style file
.bsv	Bluespec System Verilog file
.bt!	BitTorrent Partial Download file
.btm	Batch To Memory batch file (4DOS)
.btn	Buttonware file
.bto	Baytex Organix! 2001 Language Kit
.btr	Btrieve Database file
	MS Frontpage-related file
.btx	DB/TextWorks Database Term & Indexes
.bud	Quicken Backup
.bug	Bugs and Problems
.bun	Bundled Audio files
.bup	DVD Backup file
.but	Button definitions (Buttons!)
.buy	Datafile format (movie)
.bv1	Overflow file below insert point in Doc 1 (WordPerfect for Win)
.bv2	Overflow file below insert point in Doc 2 (WordPerfect for Win)
.bv3	Overflow file below insert point in Doc 3 (WordPerfect for Win)
.bv4	Overflow file below insert point in Doc 4 (WordPerfect for Win)
.bv5	Overflow file below insert point in Doc 5 (WordPerfect for Win)
.bv6	Overflow file below insert point in Doc 6 (WordPerfect for Win)
.bv7	Overflow file below insert point in Doc 7 (WordPerfect for Win)
.bv8	Overflow file below insert point in Doc 8 (WordPerfect for Win)
.bv9	Overflow file below insert point in Doc 9 (WordPerfect for Win)
.bwa	BlindWrite Disk Image Information file
.bwb	Spreadsheet application (Visual Baler)
.bwi	Blindread/Blindwrite
.bwr	Beware (buglist) (Kermit)
.bws	Blindwrite Sub Channel Data File
.bwt	Blindread/Blindwrite
.bxx	blaxxun Contact
.bz2	Bzip 2 UNIX Compressed file

.c	C source code file
	Compressed unix file archive created by COMPACT
.c++	C++ source code file
.c–	Source code (Sphinx C–)
.c00	Print file (Ventura Publisher)
	WinAce Split Archive file
.c01	Genesis 2000
.c2d	WinOnCD CD Image
.c4d	MAXON Cinema 4D File (Graphics)
.c60	Midtronics Battery Management Software
.c86	C source code file (Computer Innovation C86)
.ca	Initial cache data for root domain servers (Telnet)
.cab	Cabinet File (Microsoft installation archive)
.cache	Cache file (typically Web cache)
.cad	Softdesk Drafix CAD File
.cac	dBASE IV executable when caching on/off (see cachedb.bat)
.cad	Document (Drafix Windows CAD)
.cag	MS Clip Gallery Catalog file
.cal	Calendar file (Windows 3.x)
	Calendar Maker Pro
.calb	Coolect Album file (Coolect Album Player)
	Spreatsheet (SuperCalc)
.cam	Casio Camera Graphic
.can	Fax (Navigator Fax)
.cap	Caption (Ventura Publisher)
	Session capture file (Telix)
.car	AtHome Assistant file
	Carrara Environment
	NeoBook Cartoon
.cas	Comma-delimited ASCII File
.cat	Catalog (dBASE IV)
.cb	Clean Boot File (Microsoft)
	Brief Macro Source Code
.cbc	Fuzzy logic system (CubiCalc)
.cbf	Calendar Builder file
.cbl	Cobol source code file
.cbm	Compiled bitmap graphics (XLib)
.cbp	CentralBuilder Project
.cbr	ComicBook Reader File archive (CDisplay image viewer)
.cbt	Computer Based Training (many)
.cbz	ComicBook Reader File archive (CDisplay image viewer)
.cc	C++ source code file
.cca	CC:Mail archive file
.ccb	Visual Basic Animated Button Configuration
.ccc	Bitmap graphics (native format) (Curtain Call)
.ccd	CloneCD Related file
	Vector CAD Program file
.cce	Calendar Creator 2 Event file
.ccf	Communications configuration file (Symphony)
.cch	Chart (CorelChart)
.ccl	Communication Command Language file (Intalk)
.cco	Btx Graphics file (XBTX)
.cct	Macromedia Director Shockwave file
.ccx	Corel PrintHouse file
.cda	CD Audio Track
.cdb	Card database (CardScan)
	Main database (TCU Turbo C Utilities)
.cdd	ConceptDraw Document file
.cde	Honeywell Hybrid Control Designer
.cdf	Component Definition file
	Graphics (netcdf)
.cdg	Compact Disc Plus Graphics file
.cdi	Phillips Compact Disk Interactive format
	DiscJuggler Image file
.cdk	Document (Atari Calamus)
.cdl	CaseWare Working Papers Document Link
	SignLab Vector Graphic
.cdm	Media Maker Disk Image file
	Visual dBASE Custom Data Module
.cdp	Visual Objects Developer file
	CD/Spectrum Pro
.cdr	Vector graphics (CorelDRAW native format)
.cdt	Data (CorelDraw 4.0)
.cdx	CorelDraw Compressed Image file
	Compound index (FoxPro)
.ce	Main.ce (The FarSide Computer Calendar)
.ceb	Apabi eBook file
.ceg	Bitmap graphics (Tempra Show – Edsun Continuous Edge Graphics)
.cel	Graphics (Autodesk Animator – Lumena)
.cf	Sendmail Configuration file
	Configuration file (imake)
.cfb	Comptons multimedia file
.cfc	Macromedia Coldfusion component extension
.cfg	Configuration
.cfl	Chart (CorelFLOW)
.cfm	ColdFusion Markup Language (Allaire)
.cfn	Font data (Atari Calamus)
.cfo	C Form Object internal format object file (TCU Turbo C Utilities)
.cfp	Quicken Cash Flow Projection file
	Fax (The Complete Fax Portable)
.cfr	Crossfire Replay file
.cga	CGA display font (Ventura Publisher)
.cgd	Cricket Graph Data file
.cge	CCD Astrocamera
.cgi	Common Gateway Interface script
.cgm	Computer Graphics Metafile vector graphics (A&L – HG – many)
.ch	Header file (Clipper 5)
.ch3	Chart (Harvard Graphics 3.0)
.ch4	Presentation (Charisma 4.0)
.chd	Font descriptor (FontChameleon)
.chi	Document (ChiWriter)
.chk	Recovered data (ChkDsk)
	Temporary file (WordPerfect for Win)
.chl	Configuration History Log
.chm	Compiled HTML
.chn	Data (Ethnograph 3)
.cho	ChordPro file
.chp	Chapter file (Ventura Publisher)
.chr	Character set (Turbo C – Turbo Pascal)
.cht	Chart (Harvard Graphics 2.0 – SoftCraft Presenter)
	Interface file for ChartMaster (dBASE)
.chw	Compiled Help Index file
.cid	AnalogX Caller ID file
.cif	Caltech Intermediate Format graphics
	Chapter information (Ventura Publisher)
.ciff	Canon CIFF
.cil	Clip Gallery Download Package
.cit	Intergraph Raster File Reference
.cix	Database index (TCU Turbo C Utilities)
.ckb	Keyboard mapping (Borland C++ 4.5)
.cl	Common LISP source code file
.cl3	Easy CD Creator Layout file
.cl4	Easy CD Creator Layout file
.cl5	Easy CD Creator Layout file
.class	Java class file
.clb	ICQ Contact List
	MS Office XP Developer Code Librarian
	cdrLabel Compact Disc Label
.clg	Windows Catalog file
.cli	Client Management System Customer file
.clm	COLIMO file
.clp	Clip art graphics (Quattro Pro)
	Clipboard file (Windows 3.x)
	Compiler script file (clip list) (Clipper 5)
.clpi	Blue-ray Disc Clip Information file
.clr	Color binary screen image (1st Reader)
	Color definitions (Photostyler)
.cls	C++ class definition file
.cm	Data file (CraftMan)
.cmd	Batch file (OS/2)
	Command (dBASE – Waffle)
	External command menu (1st Reader)
.cmf	FM-music file (Creative Music File)
.cmg	CMG file
.cmk	Card (Card Shop Plus)
.cml	COMAL programming language
.cmm	Cmm script (batch) file (CEnvi)
.cmo	Virtools Composition file
.cmp	Header file for PostScript printer files (CorelDRAW)
	User dictionary (MS Word for DOS)
	Bitmap graphics (Lead CMP compression)
.cmq	Culturemetrics file
.cmt	Culturemetrics file
.cms	TrialDirector media storage
.cmv	Animation (CorelMove CorelDraw 4.0)
.cmx	Corel PhotoPaint Image
	Corel Presentation Exchange Image
	The Sims (Maxis) 3D Body Mesh Data
	Apple Viewer file
.cnc	CNC general program data
.cnd	ControlDraw file
	Embroidery Design file
.cnf	Configuration (program – printer setup)
.cnt	Helpfile contents
.cnv	Data conversion support file (Word for Windows)
	Temporary file (WordPerfect for Win)
.cob	Cobol source code file
.cod	Datafile (Forecast Plus – MS Multiplan – StatPac Gold)
	Program compiled code (FORTRAN)
	Template source file (dBASE Application Generator)
	Videotext file
.col	Color palette (Autodesk Animator – many)
	Spreadsheet (MS Multiplan)
.com	Command (memory image of executable program) (DOS)
.con	Configuration file (Simdir)
.conf	Configuration file
.config	Configuration file
.cor	Protein Structure file
	Web GPS Correction Server Export file
	WMOVIEC Input file
.cpd	Script (Complaints Desk)
.cpe	MS Fax Cover Sheet
.cpf	Fax (The Complete Fax)
	Clever Cache Profile file
.cph	Corel Print House image
.cpi	Code Page Information file (DOS)
	AVCHD Clip Information
	Colorlab Processed Image bitmap graphics
.cpl	Control panel file (Windows 3.x)
	Presentation (Compel)
.cpo	Corel Print House file
.cpp	C++ source code file
	Presentation (CA-Cricket Presents)
.cpr	Cubase Project file
.cps	Backup of startup files by Central Point PC Tools autoexec.cps
	coloured postscript files
.cpt	Compressed Mac file archive created by COMPACT PRO (ext-pc.zip)
	Corel Photo-Paint Image
	Encrypted memo file (dBASE)
	Template (CA-Cricket Presents)
.cpx	Control Panel Applet
	Corel Presentation Exchange Compressed Drawing
.cpy	Copy Books Data file
.cpz	Music text file (COMPOZ)
.cr2	Canon Raw Image file
.crc	Total Commander CRC file
.crd	Cardfile (Windows 3.x – YourWay)
	ColdRED Script file
	Guitar Chord file
.crf	Cross-reference (MS MASM – Zortech C++)
.crh	Links Games Course file
	MS Golf Image file
.crp	Encrypted database (dBASE IV)
.crs	File Conversion Resource (WordPerfect 5.1)
.crt	Terminal settings information (Oracle)
	Security certificate (Windows Sharepoint)
.crtr	Multi-Ad Creator 7 document
.crtx	Microsoft Chart Template file
.cru	Compressed file archive created by CRUSH
.crw	Canon RAW Image file
.crx	Chrome Extension file
	Links Games Course file
.crz	Links Games Course file
.cs	Visual C# Source file
.csa	Comma Deliminated Text
	Ultimate Ride Roller Coaster
.csf	Adobe Colour Settings file
	Van Dyke’s CRT/SecureCRT Script file
.csg	Graph (Statistica/w)
.csh	Hamilton Labs C Shell Script file
.csk	Claris Works
.csm	Precompiled headers (Borland C++ 4.5)
.cso	Compressed ISO Image file
.csp	PC Emcee Screen Image file (Computer Support Corporation)
.css	Cascading Sheet Style file
	Datafile (CSS – Stats+)
	Datasheet (Statistica/w)
.cst	Macromedia Director Cast file
	Panasonic music file (keyboard)
.csv	Comma Separated Values text file format (ASCII)
	Adjusted EGA/VGA palette (CompuShow)
.ct	Continous Tone file
.ctc	Control file (PC Installer)
.ctd	Cobra Track Dump
	Cardtable file
	Marine Data file
	Simpsons Cartoon Studio Export file
.ctf	Character code translation file (Symphony)
.ctg	Canon Catalog file
	Cartridge Definition file
	ChessBase Opening Book
	Canon Powershot Pro 70 Info file
.ctl	Microsoft Visual Basic Control file
	Control file (dBASE IV – Aldus Setup)
	Setup information
.ctn	CADTERNS file
.ctt	Messenger contacts file
	Labview file
.ctu	CZTU, a gamma-ray analysis program. Need the CTZU.exe file to work
.ctx	Course TeXt file (Microsoft online guides)
	Ciphertext file (Pretty Good Privacy RSA System)
.cty	SimCity City file
.cue	MS Cue Cards data
.cuf	C Utilities Form definition (TCU Turbo C Utilities)
.cul	Windows cursor library (IconForge, ImageForge, ImageForge PRO)
.cur	Cursor image file (Windows 3.x)
.cut	Bitmap graphics (Dr. Halo)
	Dr Halo CUT files
.cv4	Color file (CodeView)
.cv5	Canvas version 5
.cva	ACD Canvas Sequence Set file
	Compaq Diagnostics
.cvb	Borland BDE File
.cvd	Bitdefender
.cvp	Cover page (WinFax)
.cvr	WinFax Cover Sheet
	ElectraSoft Fax Cover Sheet
.cvs	Graphics (Canvas)
.cvt	Backup file for CONVERTed database file (dBASE IV)
.cvw	Color file (CodeView)
.cwk	Claris Works data
.cwz	CropWalker file
.cxf	Google Picasa Collage file
.cxp	Core Media Player XML-based Playlist File
.cxt	Macromedia Director Protected Cast file
.cxx	C++ source code file (Zortech C++)

.d	D programming language source code
	GBG DraftMaker Drawing File
.d00	Blaster Master Pro File
	AdLib Format File
.d10	H&R Block Deduction Pro file
	Drake Software Dat file
.d2s	Character file (Diablo 2)
.d3d	File Extension for Desktop-3D Notes
	Compressed Draw 3D file
.d64	Commodore 64 Emulator Disk Image
.dat	Data file in special format or ASCII
	Gunlok Archive
	Mitsubishi DJ-1000 and Photorun Native Format
	Nascar Racing Archive
	SPOT Graphic
	WordPerfect Merge Data
.data	Sid Tune audio file
.day	Journal file
.db	Configuration (dBASE IV – dBFast)
	Database (Paradox – Smartware)
.db$	Temperature debug info (Clarion Modula-2)
	Temporary file (dBASE)
.db2	Database (dBASE II)
.db3	Database (dBASE III)
.dba	Datafile (DataEase)
	Palm Desktop Date Book Archive
.dbb	ANSYS Database Backup
	Mopheus music file
.dbd	Business data (Business Insight)
	Debug info (Clarion Modula-2)
.dbf	Database file (dBASE III/IV – FoxPro – dBFast – DataBoss)
	Oracle 8.x Tablespace File
.dbg	Symbolic debugging information (MS C/C++)
.dbk	Database backup (dBASE IV)
.dbl	Windows XP Activation file
.dbm	Datafile (DataEase)
	Cold Fusion Template
	Menu template (DataBoss)
.dbo	Compiled program (dBASE IV)
.dbs	Database in SQL Windows format
	Datafile (PRODAS)
	Printer description file (Word – Works)
.dbt	Data Base Text (Clipper)
	Foxbase+ style memo (FoxPro)
	Memo file for database w/same name (dBASE IV – dBFast)
.dbw	Windows file (DataBoss)
.dbx	Database
	DataBeam Image
	MS Visual Foxpro Table
	Outlook Express e-mail folder file
.dca	Document Content Architecture text file (IBM DisplayWrite)
.dcf	Disk image file
.dcm	DCM Module Format
	Dicom
.dcp	Data CodePage (OS/2)
.dcr	Kodak Proprietary Image Format
	Shockwave file
.dcs	Bitmap graphics (CYMK format) (QuarkXPress)
	Datafile (ACT! Activity Files)
.dct	Database dictionary (Clarion Database Developer)
	Spell checking dictionary (Harvard Graphics 3.0 – Symphony)
.dcx	FAX Image
	ElectraSoft Fax
	PC-Paintbrush file
	Bitmap Graphics (Multipage PCX)
	Macros
	MS Visual Foxpro Database Container
.dd	Compressed Macintosh file archive created by DISKDOUBLER
.ddat	DivX Temporary file
.ddb	Bitmap graphics
.ddc	DivX Descriptor Description File
.ddf	MS Data Definition Language file
.ddi	Diskdupe Image file (ddupe322.zip)
.ddp	Device Driver Profile file (OS/2)
.de	MetaProducts Download Express incompletely downloaded file
.de7	Dance E jay 7 File
.deb	Debug script (DOS Debug)
.dec	VersaPro Declaration file
.def	Assembly header file (Geoworks)
	DATAIR data entry format file
	Defaults – definitions
.dem	Demonstration
	Graphics (VistaPro)
.des	Description Text
	Tribes 2 Game file
	Quickbooks Template
	Pro/DESKTOP file
	Interscope BlackBox file
.dev	Device driver
.dfd	Data Flow Diagram graphic (Prosa)
.dff	Criterion RenderWare 3.x 3D object format
.dfi	Outline font description (Digifont)
.dfl	Default program settings (Signature)
	FreshDownloads (FreshDownload List temp file)
	File Extension for Desktop-3D Notes
.dfm	Data Flow Diagram model file (Prosa)
.dfs	Delight Sound file
.dft	Fakt2000 file
	SolidEdge CAD file
	Workshare Synergy file
	PC Draft file
.dfv	Printing form (Word)
.dfx	Drafix file
.dgn	Graphics (MicroStation)
.dgr	Fax Page (MS Outlook Express)
	DART Pro 98 File Group Details
.dgs	Diagnostics
.dh	Dependency information for .ph (Geoworks)
.dhp	Dr. Halo PIC Format graphics (Dr. Halo II – III)
.dht	Datafile (Gauss)
.dhy	Adobe Bridge file
.dia	Diagraph graphics (Computer Support Corporation)
.dib	Bitmap graphics (Device-Independent Bitmap)
.dic	Lotus Notes / Domino dictonary file
.dif	Database (VisiCalc)
	Output from Diff command – script for Patch command
	Text file (Data Interchange Format)
.dig	Digilink Format
	Sound Designer Audio File
	Text Document
.dip	Graphics
.dir	Adobe Director Movie File
	Dialing directory file (Procomm Plus)
	Directory file (VAX)
	Movie (MacroMind Director 4.x)
.dis	DATAIR data import specification file
	Distribution file (VAX Mail)
	Thesaurus (CorelDraw)
>
.divx	DivX Encoded Movie file
.diz	Description file (Description In Zip)
.dje	MattBatt iAM-player
.djv	DJVu Scanned file
.djvu	DJVu file
.dkb	Raytraced graphics (DKBTrace)
.dl	Animation (Italian origin)
.dl_	Compressed .dll file in an Install Archive
.dld	Data (Lotus 1-2-3)
.dlg	Dialog resource script file (MS Windows SDK)
.dll	Dynamic Link Library (Windows 3.x – OS/2)
	Export/import filter (CorelDRAW)
.dls	Setup (Norton Disklock)
.dmf	Delusion/XTracker digital music file
	Packed Amiga Disk Image
.dmg	Macintosh OS X Disk Image file
.dml	Medical Manager DML System Script
.dmo	Demo (Derive)
.dmp	Dump file (eg. screen or memory)
.dms	Compressed Amiga file archive created by DISKMASHER
.dmsk	DivX Web Player Temporary file
.dna	Desktop DNA data storage file
.dnasym	Desktop DNA compiled application script
.dnax	Desktop DNA exclusion list (text)
.dne	Netica Bayes net file (Norsys Software Corp.)
.dng	Adobe Digital Negative fFile
	Dungeon file
.dnl	DigitalWebBook Electronic Book
	netMod Modem Firmware Upgrade file
.do	ModelSim Filter Design HDL Coder
.doc	Document text file
.docm	Open XML Macro-enabled Document file (Microsoft Word 2007 / Word 2010)
.docx	Open XML Document text file (Microsoft Office 2007 / Office 2010)
.dog	Screen file (Laughing Dog Screen Maker)
.doh	Dependency information for .poh (Geoworks)
.dol	Nintendo Executable file
.dos	External command file (1st Reader)
	Network driver (eg. pkt_dis.dos)
	Text file containing DOS specific info
.dot	Line-type definition file (CorelDRAW)
	Template (Word for Windows)
.dotx	Microsoft Word 2007 / Word 2010 Template file
.dox	Text file (MultiMate 4.0)
.doz	Description Out of Zip (VENDINFO)
.dp	Calendar file (Daily Planner)
	Data file (DataPhile)
.dpg	Nintendo DS MPEG Video File
.dpk	Delphi Package file
.dpp	Serif DrawPlus Drawing
.dpr	Default project- and state-related information (Borland C++)
.dps	DivX Player Skin file
.dpt	Desktop DNA template
.dpx	Digital moving picture exchange format
.dra	Map Maker Pro GIS vector layer
.drs	Display Resource (WordPerfect for Win)
.drv	Device driver eg. for printer
.drw	Drawing (various)
	Vector graphics (Micrografx Designer)
.ds	Twain Data Source file
.ds4	Vector graphics (Micrografx Designer 4.0)
.dsa	DasyTec DASYLab file
.dsb	DasyTec DASYLab file
.dsc	Discard file (Oracle)
.dsd	Database (DataShaper)
.dsf	Micrografx Designer
	PC-TRUST Document Signer
	Delusion/XTracker Digital Sample
.dsk	Project desktop file (Borland C++ – Turbo Pascal)
	Simple IDs (database)
.dsm	Digital sound module (DSI)
.dsn	ODBC Data Source file
	Design (Object System Designer)
.dsp	Display parameters (Signature)
	Graphics display driver (Dr.Halo)
	MS Developer Studio Project
	ReaderX and DragonStar Pro Ltd file extensions
.dsp2	ReaderX and DragonStar Pro Ltd file extensions
.dsr	Driver Resource (WordPerfect for Win)
.dss	Screensaver file (DCC)
	Sound (Digital Soup)
.dst	PC-RDist Distribution file
	Embroidery Machine Stitch file (VeePro)
.dsw	Desktop settings (Borland C++ 4.5)
.dsy	PC Draft Symbol Library
.dt_	Data fork of a Macintosh file (Mac-ette)
.dta	Data file (Turbo Pascal – PC-File – Stata)
.dtd	SGML Document Definition file
.dtf	Database file (PFS – Q&A)
.dtp	Document (Timeworks Publisher3)
	Publication (Publish-It!)
.dup	Duplicate Backup
.dus	Readiris font dictionary
.dvc	Data (Lotus 1-2-3)
.dvf	DV Studio Camcorder Graphics file
.dvi	Device Independent document (TeX)
.dvp	Desqview Program Information file (DESQview)
	Device parameter file (AutoCAD)
.dvr	Windows Media Center Recorded file
	DR-92 Manager file
.dvr-ms	files created by Stream Buffer Engine(SBE)
.dw2	Drawing (DesignCAD for windows)
.dwc	Compressed file archive created by DWC (dwc-a501.exe)
.dwd	Davka Writer file
	DiamondWare Digitized file
.dwf	Autodesk WHIP! Drawing Web file
	MS WHIP autoCAD REader Drawing Web file
.dwg	Drawing (Drafix)
	Drawing database (AutoCAD)
.dwk	DADiSP Worksheet File
.dwl	Drawing Lock file
.dwt	AutoCAD Template/Prototype file
	Macromedia Dreamweaver Template file
	Demon’s World Game Texture file
.dwz	DVD movieFactory 3
.dx	Text file (DEC WPS/DX format – DEC WPS Plus)
.dxf	Drawing Interchange File Format vector graphics (AutoCAD)
.dxn	Fax (Fujitsu dexNET)
.dxr	Adobe Director Movie File
	Dependable Strengths Administrator Resources
	Green Building Advisor file
	Macromedia Director Protected Movie file
.dyc	ICUII Videochat file
.dylib	Apple osx extension for lib
.dyn	Data (Lotus 1-2-3)
.dz	Dzip Compressed file

.e3p	CIM-Team E3.series parts file
.e3s	CIM-Team E3.series project file format
.e3t	CIM-Team E3.series template file
.e3v	CIM-Team E3.series viewer project file format
.eap	Enterprise Architect Project file
.ear	Java Enterprise Application Packaging Unit
.eas	Elite Visual Basic API Spy
.ebj	Error-checking object file (Geoworks)
.ebo	MS Reader Ebook Format
.ebp	Pocket PC WindowsCE Project file
.ecf	Microsoft Outlook Add-on file
	Microsoft Exchange Extended Configuration file
	WinFax Office Add-in file
.eco	NetManage ECCO file
.ecw	Ensoniq Waveset Format
	EclipseCrossword Crossword Puzzle
.edb	MS Exchange Database
	ROOTS3 geneological data
.edl	Edit Decision List (management for video/film post production)
.edr	Portable energy file – GROMACS 3.3
.eds	Ensoniq SQ80 disk image
.edt	Default settings (VAX Edt editor)
.eeb	Button bar for Equation Editor (WordPerfect for Win)
.efe	Ensoniq EPS file
.eft	High resolution screen font (ChiWriter)
.efx	Fax (Everex EFax)
.ega	EGA display font (Ventura Publisher)
.ek5	SonarData Echoview file
.ek6	SonarData Echoview file
.ekm	EXP: The Scientific Word Processor Macro
.el	Elisp source code file (Emacs lisp)
.elc	Compiled ELISP code (Emacs lisp)
.elm	MS FrontPage Theme-Pack file
.elt	Event list text file (Prosa)
.email	Outlook Express Mail Message
.emb	Everest Embedded Bank File
.emd	ABT Extended Module
.emf	Enchanced Metafile graphics
.eml	Electronic Mail (Email) Message file
.emp	E-Music File Format
.ems	PC Tools Enhanced Menu System Config
.emu	Terminal emulation data (BITCOM)
.emx	Ensuredmail encrypted file/e-mail message
	IBM Rational modeller software
.emz	Windows Compressed Enhanced Metafile
.enc	Encoded file – UUENCODEd file (Lotus 1-2-3 – uuexe515.exe)
	Music (Encore)
.end	Arrow-head definition file (CorelDRAW)
.eng	Dictionary engine (Sprint)
	Graphics (charting) (EnerGraphics)
.ens	EndNote Styles file
.env	Enveloper macro (WOPR)
	Environment file (WordPerfect for Win)
.eot	MS WEFT Embedded OpenType file
.epd	Publication (Express Publisher)
.epf	Encryption Protection (encrypted file format)
	The extension of the Entrust Profile files.
.epi	Document (Express Publisher)
.epp	EditPad Pro Project
.eps	Encapsulated PostScript vector graphics (Adobe Illustrator)
	Printer font (Epson – Xerox…) (Ventura Publisher)
.epub	Open Electronic Book file
.eqn	Equation (WordPerfect for Win)
.erd	Entity Relationship Diagram graphic file (Prosa)
.erm	Entity Relationship Diagram model file (Prosa)
.err	Error log
	Error messages for command line compilers
.esp	Ventura file
.esh	Extended Shell batch file
.esl	MS Visual FoxPro Distributable Support Library
.ess	EXP: The Scientific Word Processor Style Sheet
.est	MS Streets & Trips 2001 Trip file
.etf	Enriched Text file
	PolyEdit file
.eth	Document (Ethnograph 3)
.ets	eSignal Time and Sales file
.etx	Structure Enhanced (setext) text
.ev	SonarData Echoview file
.evi	SonarData Echoview file
.evl	SonarData Echoview file
.evr	SonarData Echoview file
.evt	Event log
.evy	Document (WordPerfect Envoy)
.ewd	Document (Express Publisher for Windows)
.ewl	EclipseCrossword Word List
	Microsoft Encarta Document
.ex	Norton Ghost Template File
.ex_	Compressed .EXE File in an Install Archive
.ex3	Device driver (Harvard Graphics 3.0)
.exc	Rexx source code file (VM/CMS)
	Exclude file for Optimize (do not process) (QEMM)
.exd	Control Information Cache
.exe	Directly executable program (DOS)
.exm	Msdos executable, system-manager compliant (HP calculator)
.exp	ICQ Saved Chat file
	QuickBooks file
.ext	Extension file (Norton Commander)
.ext2fs	filesystem driver in the Linux kernel
.exx	Intermediate file by MsgPut (IBM LinkWay)
.ezf	Fax (Calculus EZ-Fax)
.ezm	Text file
.ezp	Edify Electronic Workforce Backup Utility
.ezz	eZBackup backup file

.f	Fortran source code file
	Compressed file archive created by FREEZE
.f_i	Print IPS file
.f01	Fax (perfectfax)
.f06	Dos screen text font – height 6 pixels (fntcol13.zip)
.f07	Dos screen text font – height 7 pixels (fntcol13.zip)
.f08	Dos screen text font – height 8 pixels (fntcol13.zip)
.f09	Dos screen text font – height 9 pixels (fntcol13.zip)
.f10	Dos screen text font – height 10 pixels (fntcol13.zip)
.f11	Dos screen text font – height 11 pixels (fntcol13.zip)
.f12	Dos screen text font – height 12 pixels (fntcol13.zip)
.f13	Dos screen text font – height 13 pixels (fntcol13.zip)
.f14	Dos screen text font – height 14 pixels (fntcol13.zip)
.f16	Dos screen text font – height 16 pixels (fntcol13.zip)
.f2	FLASH BIOS file
.f2r	Linear module (music) (Farandole)
.f3r	Blocked module (music) (Farandole)
.f4v	MP4 Video file
.f77	Fortran 77 source code file
.f90	Fortran file
.f96	Fax (Frecom FAX96)
.fac	Face graphics
.faq	Frequently Asked Questions text file
.far	Farandoyle Tracker Music Module
	The Sims (Maxis) Archive file
.fav	MS Outlook Bar Shortcuts
.fax	Fax (raster graphics) (most Fax programs)
.fbc	FamilyTree Compressed backup file
.fbk	Navison Financials Backup
	FamilyTree Backup file
.fc	Spell checking dictionary (Harvard Graphics 2.0)
.fcd	Virtual CD-ROM
	FastCAD/EasyCAD Output
	Patton & Patton Flow Charting 3 file
	IsoBuster file
.fcm	Binary file patch file (forward compression)(jlpak10.zip)
.fcp	FLAMES Checkpoint Restart file (Ternion)
.fcs	Flow Cytometry Standard Format
	Fantasy Football League Organizer file
	RealProducer Pro Settings
	c-tree Server/Plus Data file
	Canon Zoom Browser EX file
	CD Trustee file
	Spectrum Server Log file
.fcw	Campaign Cartographer 2 file
.fd	Declaration file (MS Fortran)
	Field offsets for compiler (DataFlex)
.fdb	Art Explosion Portfolio Catalog file
	Legacy Family Tree Database
	Navison Financials Database
.fde	FLAMES Dataset Export file (Ternion)
.fdf	Adobe Acrobat Forms document
.fdr	Final Draft Document file
	Embroidery Design file
.fdw	Form (F3 Design and Mapping)
.feb	Button bar for Figure Editor (WordPerfect for Win)
.fef	Steuer2001 file
.fes	Fabio Editing Software
	3D Topicscape – exported fileless occurrence
.fev	FLAMES Environment Variable file (Ternion)
.ff	Outline font description (Agfa Compugraphics)
.ffa	MS Fast Find file
.fff	Fax (defFax)
.ffl	MS Fast Find file
.ffo	MS Fast Find file
.fft	Dca/FFT Final Form Text text file (DisplayWrite)
.ffx	Microsoft Fast Find file
.fgd	Folder Guard Data
	Half-life Modification Map Configuration file
	Digital Raster Graphic Metadata file
.fh3	Vector graphics (Aldus FreeHand 3.x)
.fh4	Vector graphics (Aldus FreeHand 4.x)
.fh5	Freehand 5
.fh6	Freehand 6
.fh7	Freehand 7
.fh8	Macromedia Freehand 8
.fh9	Macromedia Freehand 9
.fh10	Macromedia Freehand 10
.fi	Interface file (MS Fortran)
.fif	Fractal Image Format file
.fig	REND386/AVRIL Graphic
	Super Nintendo Game-console ROM Image
.fil	File template (Application Generator)
	Files list object file (dBASE Application Generator)
	Overlay (WordPerfect)
.fin	Print-formatted text file (Perfect Writer – Scribble – MINCE)
.fio	PhotoStyler graphics (filter)
	ULead Viewer (support file)
.fit	Fits graphics
	File Index Table (WindowsNT)
.fix	Patch file
.fky	Macro file (FoxPro)
.fla	Adobe Flash file
.flac	Free Lossless Audio Codec
.flb	Format library (Papyrus)
.flc	Animation (Autodesk Animator)
.fld	Folder (Charisma)
.fle	Flea program: outbound file and attachment required by the given mailer environment
.flf	Corel Paradox Form
	Firehand Lightning Graphic Collection
	Navison Financials License file
	OS/2 Driver file
	FLAMES License file, Enterprise Edition (Ternion)
.fli	Tex font library (EmTeX)
	Animation (Autodesk Animator)
.flk	File Locker Encrypted file
.flm	Film Roll (AutoCAD/AutoShade)
.flo	Micrografx FlowCharter
.flp	Adobe Flash Project file
	FlipAlbum file
	Fruityloops Saved file
.flt	Asymetrix Graphics Filter Support file
	CoolEdit Pro Filter
	Corel Graphic Filter
	FileMaker Filter
	FLIC Animation (DTA)
	Micrografx Picture Publisher Filter
	MS Graphics Filter
	MulitGen Open Flight file
	OS/2 Warp Filter Device Driver
	StarTrekker Music Module
	WinFlash Educator Flashcard Compiled Test file
.flv	Adobe Flash Video file
.flx	Compiled binary (DataFlex)
.fm	Spreatsheet (FileMaker Pro)
	FrameMaker file
.fm1	Spreadsheet (Lotus 1-2-3 release 2.x)
.fm3	Device driver (Harvard Graphics 3.0)
	Spreadsheet (Lotus 1-2-3 release 3.x)
.fmb	File Manager Button bar (WordPerfect for Win)
.fmf	Font or icon file (IBM LinkWay)
.fmg	FreeMarkets Graphics Browser
.fmk	Makefile (Fortran PowerStation)
.fmo	Compiled format file (dBASE IV)
.fmp	FileMaker Pro Document
	FLAMES Model Prototype file for components written in C (Ternion)
.fmpp	FLAMES Model Prototype file for components written in C++ (Ternion)
.fmt	Format file (dBASE IV – FoxPro – Clipper 5 – dBFast)
	Style sheet (Sprint)
.fmv	Frame Vector Metafile
.fmz	Form Z Program files (drawing program)
.fn3	Font file (Harvard Graphics 3.0)
.fnt	Font file (many)
.fnx	Inactive font (Exact)
.fo1	Font file (Borland Turbo C)
.fo2	Font file (Borland Turbo C)
.fol	Folder of saved messages (1st Reader)
.fon	Dialing directory file (Telix)
	Font file (many – Windows 3.x font library)
	Log of all calls (Procomm Plus)
.for	Fortran source code file
	Form (WindowBase)
.fot	Installed Truetype font (Windows Font Installer)
.fp	Configuration file (FoxPro)
.fp3	FileMaker Pro 3.0 and earlier files
	Floor Plan 3D Drawing file
.fp4	FileMaker Pro 4.0
.fp5	FileMaker Pro 5.0 and later files
.fpb	FLAMES Playback Recorder file (Ternion)
.fpc	Catalog (FoxPro)
.fpk	JetForm FormFlow file
.fpr	FLAMES Prototype file (Ternion)
.fpt	Memo (FoxPro)
.fpw	Floorplan drawing (FloorPLAN plus for Windows)
.fpx	FlashPix Bitmap
.fqy	FLAMES FLARE Command file (Ternion)
.fr3	Renamed dBASE III+ form file (dBASE IV)
.frc	FLAMES Recorder Output file; FLARE Input file (Ternion)
.frd	Files which contain loudspeaker frequency response data
.fre	Creative Digital Blaster Digital VCR file
	Male Normal CT
.frf	Font (FontMonger)
.frg	Uncompiled report file (dBASE IV)
.frl	FormFlow file
.frm	MySQL Database Format file
	Form (Visual Basic)
	Report file (dBASE IV – Clipper 5 – dBFast)
	Text (order form)
.fro	Compiled report file (dBASE IV)
.frp	Form (PerForm PRO Plus – FormFlow)
.frs	Screen Font Resource (WordPerfect for Win)
.frt	Report memo (FoxPro)
.frx	Report (FoxPro)
.fs	F# Source Code file
.fsc	FLAMES Scenario file (Ternion)
.fsh	EA Sports Game Graphic Editor file
.fsl	Form (Paradox for Windows)
.fsm	Farandoyle Sample format music
.fst	Linkable program (dBFast)
.fsproj	Store Firestarter projects used to generate class mapping definitions for Habanero Firestarter
.fsx	Data (Lotus 1-2-3)
.fsy	Fileware’s Filesync
.ftm	Font file (Micrografx)
.fts	Windows Help Full-Text Search Index file
.ftw	Family file
	FontTwister
.ftp	Configuration (FTP Software PC/TCP)
.fus	Files that store user settings for various FLAMES applications (Ternion)
.fvt	Interlock Public Computer Utility
.fw	Database (FrameWork)
.fw2	Database (Framework II)
.fw3	Database (Framework III)
.fwp	FLAMES Window Viewer project file (Ternion).
.fx	DirectX Effects file
	On-line guide (FastLynx)
.fxd	Phonebook (FAXit)
.fxm	WinFax/WinFax MiniViewer Fax
.fxo	Fax Image Document
.fxp	Compiled format (FoxPro)
.fxr	WinFax Received Document
.fxs	Fax Transmit Format graphics (WinFax)

.g	Data chart (APPLAUSE)
.g3	Group 3 Fax document; Group 3 Fax
.g3f	Zetafax TIFF file (fine resolution)
.g3n	Zetafax TIFF file (normal resolution)
.g8	Raw graphics (one byte per pixel) plane three (PicLab)
.gab	Global Address Book file
.gal	Corel Multimedia Manager Album
.gam	Saved Game file
	Fax (GammaFax)
	TADS 2.x Game file
	Baldur’s Gate Game file
	Animated E-mail
.gat	Gator file
.gb	Pagefox Bitmap Image file
	GameBoy ROM
.gba	Game Boy Advanced ROM
	GrabIt Batch files
.gbc	Game Boy COlor ROM
.gbd	Gator Banner file
.gbl	Global definitions (VAXTPU editor)
.gbr	GIMP Brush file
	Gerber Format file
.gbx	Gerber file
.gc1	Lisp source code (Golden Common Lisp 1.1)
.gc3	Lisp source code (Golden Common Lisp 3.1)
.gcd	Graphics
.gcf	Steam GCF File
.gdb	Interbase Database
	Group Mail file
.gdf	Dictionary file (GEOS)
.gdr	Bitmap Font file (SymbianOS)
.ged	Editor’s native file format (Arts & Letters)
	GEDCOM Family History file
	Graphic Environment Document
	Graphics editor file (EnerGraphics)
	Game Editor Project File
.gem	Vector graphics (GEM – Ventura Publisher)
.gen	Compiled template (dBASE Application Generator)
	Generated text (Ventura Publisher)
	Genius Family Tree
.geo	Geode (Geoworks)
.gfb	Compressed GIF image created by GIFBLAST (gifblast.exe)
.gft	Font (NeoPaint)
.gfx	Genigraphics Graphics Link Presentation
	Graphic format used by Allen Bradley SCADA Software (RSView Works)
.gg	Google Desktop Gadget file
.gho	Symantec Ghost Disk image file
.ghs	Lasertank High Scores
	Symantec Ghost Disk Image Span file
.gib	Chart (Graph-in-the-Box)
.gid	Windows Help index file
.gif	Graphics Interchange Format bitmap graphics (CompuShow)
.gig	Sound file
.giw	Presentation (Graph-in-the-Box for Windows)
.gl	Animation (GRASP GRAphical System for Presentation)
.glm	Datafile (Glim)
.gls	Datafile (Across)
.gly	Glossary (MS Word)
.gmd	Game Maker file format
.gmf	CGM graphics (APPLAUSE)
.gml	Geography Markup Language file
.gmp	Geomorph tile map (SPX)
.gno	Genopro Genealogy Document file
.gnt	In MF COBOL a compiled .cbl file
.goc	Goc source code file (Geoworks)
.goh	Goc header file (Geoworks)
.gp	Geode parameter file (Geoworks Glue)
.gp3	CCITT Group 3 file
	GuitarPro 3
.gp4	Guitar Pro version 4.06
.gpd	VISUAL EPR Input Data for PARAMS.EXE
.gph	Graph (Lotus 1-2-3/G)
.gpk	Omnigo program package
.gpx	GPS eXchange Format
.gr2	Screen driver (Windows 3.x)
.gra	Datafile (SigmaPlot)
.grb	Ms-DOS Shell Monitor file (MS-DOS 5)
.grd	Gradebook Power file
	Map Projection Grid file
.grf	Micrografix Image file
	Graph file (Graph Plus – Charisma)
.grl	Matlab Graphic Format
.grp	Group file (Windows 3.x – Papyrus)
	Pictures group (PixBase)
.grx	File list (GetRight)
.gry	Raw GREY graphics
.gs1	Presentation (GraphShow)
.gsd	Vector graphics (Professional Draw)
	GSplit file splitting utility (GDGsoft.com)
.gsm	Raw GSM 6.10 Audio Stream
	Sound file
	US Robotics modem file
.gsp	Geometer’s Sketchpad Material file
.gsw	Worksheet (GraphShow)
.gtp	Gnome Desktop Theme file
	GuitarPro file
.gts	Genome Software Tempo Alarm Clock
.gup	Data (PopMail)
.gwi	Groupwise File
.gwp	Greetings WorkShop file
.gxd	General CADD Pro file
	GX-Reports file
	Jeol EX Spectrometer Data file
.gxl	Graphics library (Genus)
.gxt	GTA2 Game file
.gym	Sega Genesis Music Logged Format
.gz	Compressed file archive created by GZIP (GNU zip)
.gzip	Compressed file archive created by GZIP (GNU zip)

.h	Header file
.h!	On-line help file (Flambeaux Help! Display Engine)
.h++	Header file (C++)
.h–	Header file (Sphinx C–)
.ha	Compressed file archive created by HA (ha098.zip)
.ham	Image file
.hap	Compressed file archive created by HAP (hap303re.zip)
.hbk	Handbook (Mathcad)
.hbs	eBerry Transparent Animation – compressed bitmap files
.hcr	IBM HCD/HCM Production Configuration
.hdf	Hierarchical Data File graphics (SDSC Image Tools)
	Help file (Help Development Kit)
.hdl	Alternate download file listing (Procomm Plus)
.hdp	HD Photo File
	Magix Music/Video
.hdr	InstallShield Setup header
	Pc-File+ Database header
	Datafile (Egret)
	Message header text (Procomm Plus – 1st Reader)
.hds	Windows Digital Right Management file
.hdw	Vector graphics (Harvard Draw)
.hdx	Help index (AutoCAD – Zortech C++)
.hed	HighEdit document
.hex	Hex dump
.hfi	Hp Font Info file (GEM)
.hfx	HotFax file
	US Robotics Rapid Comm Voice Data file
.hgl	Hp Graphics Language graphics
.hh	C++ header file
.hhc	Table of Contents file
	TurboTax Contents file
.hhh	Precompiled header file (Power C)
.hhk	Help Workshop Index file
.hhp	Help information for remote users (Procomm Plus)
.hht	MS Messenger file
.hin	Molecule (HyperChem)
.his	Insight II Dynamics Trajectory History file
	Spy-CD CD Search Database file
.hlb	Help library (VAX)
.hlp	Help information
.hlz	Multi-Edit Packed Help file
.hm3	Help & Manual 3 project Format
.hmm	Alternate Mail Read option menu (Procomm Plus)
.hnc	CNC program files Heidenhain (?) dialog
.hof	Hall Of Fame (game scores)
.hp8	Ascii text HP Roman8 character set (NewWave Write)
.hpf	Hp LaserJet fonts (PageMaker)
.hpg	HPGL plotter file vector graphics (AutoCad – Harvard Graphics)
.hpi	Font information file (GEM)
.hpj	Help project (MS Help Compiler)
.hpk	Compressed file archive created by HPACK (hpack75.zip)
.hpm	Emm text (HP NewWave)
	Alternate Main menu for privileged users (Procomm Plus)
.hpp	C++ header file (Zortech C++)
.hqx	Compressed Macintosh ASCII archive created by BINHEX (xbin23.zip)
.hrf	Graphics (Hitachi Raster Format)
.hrm	Alternate Main menu for limited/normal users (Procomm Plus)
.hs2	Monochrome image (Postering)
.hsi	Handmade Software Inc. graphics – almost JPEG (Image Alchemy)
.hst	Yahoo Messenger History file
	History file (Procomm Plus)
.hta	Hypertext application
.htc	HTML Component (mechanism for implementing Dynamic HTML in script)
.htf	WebBase File
.hti	WebBase File
.htm	HyperText Markup Language document
.html	HyperText Markup Language document
.htr	Motion Analysis Software Skeletal file
.htt	Hypertext template
.htx	Hypertext file
.hus	Husqvarna Designer I Embroidery Machine Format
.hwd	Presentation (Hollywood)
.hxm	Alternate Protocol Selection menu for all users (Procomm Plus)
.hxx	C++ header file
.hy1	Hyphenation algorithms (Ventura Publisher)
.hy2	Hyphenation algorithms (Ventura Publisher)
.hyc	Data (WordPerfect)
.hyd	Hyphenation dictionary (WordPerfect for Win)
.hyp	Compressed file archive created by HYPER (hyper25.zip)
.hyt	VFSMOD Project output file

.i	Intermediate file (Borland C++ 4.5)
.iaf	MS Outlook 97 and 2000 e-mail account settings
.iax	Bitmap graphics (IBM Image Access eXecutive)
.ibm	Compressed file archive created by ARCHDOS (Internal IBM only)
.ibd	Installer Dialog Resource file
.ibp	Isobuster Image file
.ibq	Isobuster Managed Image file
.ica	Bitmap graphics (Image Object Content Architecture)
.icb	Bitmap graphics
.icc	Kodak Printer Image
	IronCAD Catalog
.icd	IronCAD 2D CAD file
.icl	Icon library (ActivIcons, IconForge, ImageForge, ImageForge PRO)
.icm	Image Color Matching Profile file
	ICC Profile, Acer Monotor Drive
.icn	Icon source code file
.ico	Icon (Windows 3.x)
.ics	iCalendar Calendar file
.id	Disk identification file
	Lotus Notes User ID file
.id2	Windows Live Messenger Emoticon file
.idb	Database Used by Disassembler
	MS Developer Intermediate file
.ide	Project (Borland C++ 4.5)
.idf	ARTiSAN Real-time Studio ID file
	MIDI Instruments Drivers file
.idl	MS Visual C++ Interface Definition file
	OMG CORBA Interface Definition Language
.idw	Vector graphics (IntelliDraw)
.idx	Index (many – FoxPro)
.ies	Photometric file data
.ifd	Form (JetForm Design)
.iff	Interchange File Format bitmap graphics/sound (Amiga)
	Maxis The Sims Object file
	Philips CDI File
	Sun TAAC Image File Format (SDSC Image Tool)
.ifo	Saved graphic objects (ImageForge PRO)
.ifp	Script (KnowledgeMan)
.ifs	Fractal image compressed file (Yuvpak)
	System file (OS/2) hpfs.ifs
.igr	Intergraph SmartSketch Drawing
.igs	IGES-Format
.igx	iGrafx Process
.iif	QuickBooks for Windows Interchange file
.ilb	Data (Scream Tracker)
.ilk	Outline of program’s format (MS ILink incremental linker)
.im30	Sun Raster image file
.im8	Sun raster graphics
.ima	Mirage vector graphics (EGO, Chart, Autumn)
.imb	IncrediMail file
.imc	IncrediMail file
.imd	Caseware IDEA (GIS data file)
.imf	ImageForge/IconForge saved filtered brushes(IconForge, ImageForge, ImageForge PRO)
.img	Bitmap graphics (Ventura Publisher – GEM Paint)
.imm	IncrediMail Trash
.imn	IncrediMail Notifier
.imp	Spreadsheet (Lotus Improv)
	Impaticized PowerPoint file
.imq	Image presentation (ImageQ)
.ims	Incredimail Graphic
.imv	Yahoo Instant Messenger IMVironment
	Impaticized Video format
.imw	Imageware Surfacer 3D CAD Surface Geometry
	IncrediMail Sound
.imz	Compressed floppy image
.in$	Installation file (HP NewWave)
.in3	Input device driver (Harvard Graphics 3.0)
.inb	Test script (Vermont HighTest)
.inc	Include file (several programming languages)
.ind	Index (dBASE IV)
	Adobe InDesign document file
.indd	Adobe InDesign file format
.inf	Type 1 LaserJet font information file (soft font installers)
	Information text file (ASCII)
	Install script
.ini	Initialization file
.ink	Pantone reference fills file (CorelDRAW)
.inl	MS Visual C++ Inline Function file
.inp	GIS Software Text Input file
	Oracle Source Code
	Self-Extracting Archive Utility Project
.ins	Data (WordPerfect)
	Installation script (1st Reader)
	Instrument music file (Adlib)
.int	Borland Interface Units
	Program saved in Internal (semi-compiled) format (Signature)
.inv	Rogue Spear Inventory file
.inx	Foxpro Index (Foxbase)
.io	Compressed file archive created by CPIO
.iob	3d graphics database in TDDD format
.ioc	Organizational chart (Instant ORGcharting!)
.ion	4dos descript.ion file (file descriptions)
.ipa	iPod/iPhone Application file
.ipd	BlackBerry Backup file
	InstallPROG 6 EDBS Install Database
.ipg	Mindjongg Format
.ipj	Impatica OnCue Project file
.ipl	Pantone Spot reference palette file (CorelDRAW)
.ipp	Help & Manual Proprietary Image
.ips	Game Patch file
	MENSI 3Dipsos
.ipsw	IPod/IPad/IPhone Software file
.ipx	IPIX AV file
.ipz	ICQ Skin Plus
.iri	IR Image file
.irs	Resource (WordPerfect)
.isd	Spelling Checker dictionary (RapidFile)
.ish	Compressed file archive created by ISH
.isk	Command file
.iso	Easy CD Creator Disc Image
	File List for CD-ROM
	InstallShield Uninstall file
	ISO Buster file
	ISO-9660 Table
	RichWin
	Vector Graphics (IsoDraw Illustration)
.isr	MS Streets & Trips Route file
.iss	InstallShield Response file
	ISS Graphic
.ist	Digitrakker Instrument File (n-FaCToR)
.isu	InstallShield Uninstall Script
	Easy CD Creator 4 Uninstall file
	Netscape file
.isz	An extension on .ISO that allows compression and splitting of an archive
.it	Settings (intalk)
.itc2	iTunes Album Data file
.itdb	iTunes Database file
.itf	Interface file (JPI TopSpeed Pascal)
.ith	InTether technology secured file
.itl	Music Library file
.iv	OpenInventor files (the successor to Inventor)
.iva	security video data file
.ivt	MS Infoviewer Title
.iw	Presentation flowchart (IconAuthor – HSC InterActive)
.iwa	Text file (IBM Writing Assistant)
.iwd	Call of Duty Game Data file
.iwp	Text file (Wang)
.izt	Izl binary token file (IZL)

.j01	File Extension from ADP Payroll Company
.jad	Java Application Descriptor extension (for installing MIDlets)
.jar	Java archive file
.jas	Graphics
.jav	Java source code file
.java	Java source code file
.jbc	Jam Byte-Code Hex file
	BestCrypt File
.jbd	Datafile (SigmaScan)
.jbf	Paint Shop Pro browser file
.jbk	Juno Backup file
.jbr	Jasc Paint Shop Pro Brush
.jbx	Project file (Project Scheduler 4)
.jdt	Accelio Capture Classic Filler
.jef	Janome NH10000 Sewing Machine file
.jet	Fax (Hybrid JetFax)
.jff	Bitmap graphics (JPEG File Interchange Format)
.jfif	JPEG image
.jfx	J2 Fax File
.jhtml	Dynamo Server Page
.jif	JPEG/JIFF Image
	Jeff’s Image Format
.jmx	JMeter file
.jnb	Sigma Plot Workbook file
.jnl	Ingres Journal file
.jnlp	Java Web Start file
.jnt	Windows Journal Note file
.job	Job file
	Task Scheduler Task Object
	AI Research file
	QuestVision Vector Graphics file
.jor	Journal file SQL
.jou	Journal backup (VAX Edt editor)
.jp2	JPEG 2000 file
.jpc	Graphics (Japan PIC)
.jpeg	JPEG image
.jpf	JPEG 2000 file
.jpg	Bitmap graphics (Joint Photography Experts Group)
.jps	Stereo Image
.jpx	JBuilder Project file
.js	Microsoft Scripting Language “JScript” file extension
.jsd	eFAX Jet Suite Document
.jse	JScript Encoded Script file
.jsf	Fireworks Batch Script file
.jsh	Henter-Joyce, Inc. Jaws Script Header file
.json	JavaScript Object Notation file
.jsp	Java Server page
.jtf	Fax (Hayes JT Fax)
	Bitmap graphics (JPEG Tagged Interchange Format)
.jtp	Jetform file
.jup	(New Planet Software) Code Crusader user’s project preferences file
.jw	Text document (JustWrite)
.jwl	Library (JustWrite)
.jwp	Easy CD Creator Label file
	JWP Document
.jxr	JPEG XR file
.jzz	Spreadsheet (Jazz)

.kar	Midi file with karaoke word track
.kau	Sassafras KeyAudit Audit file
.kb	Keyboard script (Borland C++ 4.5)
	Program source (Knowledge Pro)
.kbd	Keyboard mapping (LocoScript – Signature – Procomm Plus)
.kbm	Keyboard mapping (Reflection 4.0)
.kcl	Lisp source code (Kyoto Common Lisp)
.kcp	Keychamp file
.kdc	Kaspersky Virus Database file
	Kodak Photo-Enhancer/Photogen file
.keo	Older, outdated Print Shop extension
.ket	Older, outdated Print Shop extension
.kex	Macro (KEDIT)
.kext	Mac OS X Kernel Extension
.key	Datafile (Forecast Pro)
	Keyboard macros
	WinRAR License file
	Security file eg. Shareware Registration info
.kgb	KGB Archive file
.kit	Raven Toolkit file
.kix	KixTart Script
.kma	Kodak Memory Book file
	Correlate K-Map
.kml	Keyhole Markup Language file
.kmp	Korg Trinity KeyMaP file
.kmx	Kaufman Mmail Warrior Mail Folder
.kmz	Google Earth Map Location file
.kos	MicroType Pro Document
.kp2	Kruptos Encrypted file
.kpl	Kazaa Playlist
	KPL Source Code
.kpp	Toolpad (SmartPad)
.kps	Ibm KIPS bitmap graphics
.kqb	Knowledge Question Base file
.kqe	W32/Spybot.KQE Worm virus
.kqp	Konica Quality Picture
.krz	Kurzweil 2000 Sample
.ksd	Native Instruments Audio Patch file
.ktk	Kutoka’s Mia
.kwi	Navigation Data file
.kwm	WebMoney Private Key file
.kyb	Keyboard mapping (FTP Software PC/TCP)

.l	Lex source code file
	Lisp source code file
	Linker directive file (WATCOM wlink)
.l01	ARC Digitized Raster Graphics
.lab	Datafile (NCSS – SOLO)
	Mailing labels (Q+E for MS Excel)
.lang	Skype Language file
.lat	Crossword Express Lattice file
.latex	LaTeX typesetting system
.lay	Word chart layout (APPLAUSE)
.lbg	Label generator data (dBASE IV)
.lbl	Label (dBASE IV – Clipper 5 – dBFast)
.lbm	Bitmap graphics (DeluxePaint)
	Linear bitmap graphics (XLib)
.lbo	Compiled label (dBASE IV)
.lbr	Compressed file archive created by LU (lue220.arc)
	Display driver (Lotus 1-2-3)
.lbt	Label memo (FoxPro)
.lbx	Label (FoxPro)
.lcf	Linker Control File (Norton Guides compiler)
.lck	Lockfile (Paradox)
.lcl	Data (FTP Software PC/TCP)
.lcn	Lection (WordPerfect)
.lcs	Datafile (ACT! History Files)
	L0phtCrack Audit file
.lcw	Spreadsheet (Lucid 3-D)
.ld	Long Distance codes file (Telix)
.ld1	Overlay file (dBASE)
.ldb	Data (MS Access)
.ldf	Library definition file (Geoworks Glue)
	locking data file or (locking security file)
	IBM Works for OS/2 Filer Form
	Microsoft SQL Server Transaction Log File
.ldif	LDAP Data Interchange Format
.leg	Legacy Graphic Format
.les	Lesson (check *.cbt)
.let	Letter
.lev	Level file (NetHack 3.x)
.lex	Lexicon (dictionary) (many)
.lfa	LifeForm file
.lft	Laser printer font (ChiWriter)
.lg	Logo procedure definitions (LSRHS Logo)
.lgc	Program Use Log file
.lgo	Logo for header and footer (SuperFax)
	Startup logo code (Windows 3.x)
.lgx	Gerber file
.lha	Compressed file archive created by LHA/LHARC (lha255b.exe)
.lhw	Compressed Amiga file archive created by LHWARP
.lib	Library file (several programming languages)
.lic	License file (Shareware)
	FLAMES License File Professional Edition (Ternion)
.lid	Kodak Gallery Album file
	WinDVD file
	Light Field Description file
	Dylan Library Interchange Description
	LabelVision Auto Incrementing Value file
	Maple V Setup file
	Scholar’s Aid Backup file
.lif	Logical Interchange Format data file (Hewlett-Packard)
	Compressed file archive
.lim	Compressed file archive created by LIMIT (limit12.zip)
.lin	Line types (AutoCAD)
.lis	Listing (VAX)
.lit	MS Reader eBook file
.lix	Extend Simulation Library file
	Libronix DLS Resource (LLS 2.x Index)
.lj	Text file for HP LJ II printer
.lko	MS Outlook Express Linked Object
.ll3	Laplink III related file (document) (LapLink III)
.lmp	Lump File
.lmt	Nokia PC Suite Log file
	RPG Maker map tree file
.lnd	3D Landscape Data
.lng	Adobe Acrobat Language Plugin file
	Diablo II file
	NRG SDR Language file
.lnk	Windows Shortcut file
	Linker response file (.RTLink)
.loc	MicroSim PCBoard Component Locations Report
	Suppose Locations file
	Download format for search results on Geocaching.com
.lod	Load file
.log	Log file
.lok	Encrypted and compressed archive format (FileWrangler, SecurDesk!, ZipWrangler)
.lpc	Printer driver (TEKO)
.lpd	Helix Nuts and Bolts File
	Avery Label Pro
.lpf	Lytec’s Direct Electronic Medical Claims ClaimsDirect
.lpi	Live Pictures
.lpk	Licensed ActiveX Control for Internet Explorer.
.lrf	Linker response file (MS C/C++)
.lrs	Language Resource File (WordPerfect for Win)
.lse	Nokia Audio Manager
.lsf	Streaming Audio/Video file
	Libronix DLS Resource
.lsl	Lotus Script Library
.lsp	Lisp source code file (Xlisp)
.lss	Spreadsheet (Legato)
.lst	Keyboard macro (1st Reader)
	List file (archive index – compiler listfile)
	Spool file (Oracle)
	SAS Program file
.lt2	e frontier Poser file
.ltm	Form (Lotus Forms)
.ltr	Letter
.lua	Lua Source Code file
.lvl	Game Level file
.lvp	Lucent Voice Player
	LView Pro
.lwa	LightWorks Archive Material/Scene file
.lwd	Text document (LotusWorks)
.lwo	NewTek Lightwave Object
.lwp	IBM Word Pro / Lotus Word Pro 96/97 document file
.lwz	MS Linguistically Enhanced Sound file
.lx	Lexico – files with source code
.lyr	DataCAD Layer file
.lzd	Difference file for binaries (Ldiff 1.20)
.lzh	Compressed file archive created by LHA/LHARC (lha255b.exe)
.lzs	Compressed file archive created by LARC (larc333.zip)
.lzw	Compressed Amiga file archive created by LHWARP
.lzx	Compressed file

.m	Function (program) (Matlab)
	Macro module (Brief)
	Standard package (Mathematica)
.m11	Text file (MASS11)
.m1v	MPEG-1 Video file
.m2p	MPEG-2 Program Stream Format file
.m2ts	BDAV MPEG-2 file
.m2v	MPEG-2 Video Only file
.m3	Modula 3 source code file
.m3d	3D animation macro
.m3u	Music Playlist (Winamp)
.m4	M4 preprocessor file (unix)
.m4a	MPEG-4 Audio Layer
.m4b	MPEG-4 Audio Book file
.m4p	MPEG-4 Encoded Audio file
.m4r	iPhone Ringtone file
.m4v	Apple Video file
.m_u	Backup of boot sector, FAT and boot dir (MazeGold)
.ma3	Macro (Harvard Graphics 3.0)
.mac	Bitmap graphics (Macintosh MacPaint)
	Macro
.mad	MS Access Module Shortcut
.maff	Mozilla Archive Format file
.mag	Woody Lynn’s MAG graphics format (MPS Magro Paint System)
.mai	Mail (VAX)
.mak	Makefile
	Project file (Visual Basic)
.man	Command manual
.map	Color palette
	Format data (Micrografx Picture Publisher)
	Linker map file
	Map (Atlas MapMaker)
	Network map (AccView)
.mar	Mozilla Archive
	Microsoft Access Report file
	Assembly program (VAX Macro)
.mas	Smartmaster set (Freelance Graphics)
.mat	Data file (Matlab)
	Microsoft Access Shortcut file
.max	Max source code file
	Microsoft Data Analyser View
.mb	Memo field values for database (Paradox)
.mbf	MS Money Backup file
.mbk	Multiple index file backup (dBASE IV)
	Medisoft for Windows Backup
.mbx	Mailbox (Eudora/Zerberus)
.mcc	Configuration file (Mathcad)
.mcd	Document (Mathcad)
.mcf	Mathcad font
	Meta Content Format file
	Master Command file
	TMPGEnc template
.mci	Mci command script (Media Control Interface)
.mcp	Application script (Capsule)
	Printer driver (Mathcad)
.mcr	DataCAD Keyboard macro file
.mcw	Text file (MacWrite II)
.mcx	Graphic file
.md	Compressed file archive created by MDCD (mdcd10.arc)
.md5	MD5 Checksum file
	Message Digest 5 (Easy MD5 Creator)
.mda	Data (MS Access)
.mdb	Database (MS Access)
.mde	Microsoft Access MDE database
.mdf	Accelio Capture Classic (JetForm) Filler
	I-deas Master Drafting Machine Data file
	Menu Definition file
	MS-SQL Master Database file
	Alcohol 120% CD Image File
.mdi	Microsoft Office 2003 imaging format
	Borland multiple document interface
.mdk	Keyboard Map file
.mdl	Model (3D Design Plus)
	Spreadsheet (CA-Compete!)
.mdm	Modem definition (TELIX)
.mdmp	Microsoft Windows XP Trouble Report
.mdr	FaxTalk Modem Doctor Modem Report file
.mdt	Data table (MS ILink incremental linker)
.mdx	Multiple index file (dBASE IV)
.mdz	MS Access Wizard Template
.me	Usually ASCII text file READ.ME
.meb	Macro Editor bottom overflow file (WordPerfect Library)
.med	Macro Editor delete save (WordPerfect Library)
	Music (OctaMED)
.mem	Macro Editor macro (WordPerfect Library)
	Memory variable save file (Clipper – dBASE IV – FoxPro)
.meq	Macro Editor print queue file (WordPerfect Library)
.mer	Macro Editor resident area (WordPerfect Library) (vakioalue)
.mes	Macro Editor work space file (WordPerfect Library)
	Message
.met	Document (Omnipage Pro)
	eDonkey2000 file
	Macro Editor top overflow file (WordPerfect Library)
	Presentation Manager Meta file
.meu	Menu group (DOS Shell)
.mex	Mex file (executable command) (Matlab)
	Macro Editor expound file (WordPerfect Library)
	Mioplanet mex reader interactive file
.mf	Metafont text file
.mfx	ImageMAKER Fax Viewer folder file
.mgf	Font (Micrografx)
.mgi	Modular Gateway Interface
.mgp	MagicPoint Presentation file
.mhp	MS Home Publishing Project
.mht	MS MHTML Document
.mia	MusicIndiaOnline player music file
.mib	Snmp MIB file
.mic	Microsoft Image Composer file
.mid	Standard MIDI file (music synthetizers)
.mif	Maker Interchange Format (FrameMaker)
.mii	Datafile (MicroStat-II)
.mim	MIME file
.mio	Multimedia Interactive Object
.mip	Paint Shop Pro Multiple Image Print file
.mis	Delta Force Land Warrior Mission
	MagicInstall Installation Script
	Tribes 2 Game file
.mix	Object file (Power C)
.mk	Makefile
.mkd	Pervasive Btrieve files
.mke	Makefile (MS Windows SDK)
.mki	Japanese graphics MAKIchan format (MagView 0.5)
.mks	Data (TACT)
.ml3	Project (Milestones 3.x)
.mlb	Macro library file (Symphony)
.mlm	Novel Groupwise e-mail file
.mm	Text file (MultiMate Advantage II)
.mmc	Media Catalog
	MSoffice Media Content
.mmd	Peristudio/PeriProducer file
.mmf	Mail message file (MS Mail)
.mml	Mail Meta Language
.mmm	Movie (RIFF RMMP format) (MacroMind Director 3.x)
.mmo	Memo writer file (RapidFile)
.mmp	Output video format from Bravado board
.mmx	Command & Conquer Red Alert 2 Map file
	Oracle Forms Compiled Menu
.mmz	MusicMatch Theme file
.mnd	Menu source (AutoCAD Menu Compiler)
.mng	Map (DeLorme Map’n’Go)
.mnt	Menu memo (FoxPro)
.mnu	Advanced macro (HP NewWave)
	Menu (AutoCAD Menu Compiler – Norton Commander – Signature)
.mnx	Compiled menu (AutoCAD)
	Menu (FoxPro)
.mny	Account book (MS Money)
.mob	Device definition (PEN Windows)
.mod	Modula-2 source code file (Clarion Modula-2)
	Windows kernel module
	Music (FastTracker – many)
.mol	MDL Molfile
.mon	Monitor description (ReadMail)
.mov	QuickTime Video Clip
	Apple QuickTime Audio
	AutoCAD AutoFlix Movie
.mp2	Mpeg audio file (xing)
.mp3	mp3PRO Audio file
	MPEG Audio Stream, Layer III
	SHARP MZ-series Emulator file
	Wrapster Wrapped file
.mp4	MPEG-4 Video File
.mpa	MPEG Audio Stream, Layer I, II or III
.mpc	Calender file (MS Project)
.mpd	MS Project database file
.mpe	MPEG Movie Clip
.mpeg	MPEG Movie Clip
.mpf	MS Design Gallery
	MosASCII Project Workspace file
.mpg	MPEG-1 animation
.mpl	Playlist Data file
.mpls	Blu-ray Information file
.mpm	Mathplan macro (WordPerfect Library)
.mpp	Project file (MS Project)
	CAD Drawing File
.mpq	Blizzard Game Data file
.mpr	Generated program (FoxPro)
.mps	Multimedia File
	Casio PDL Pocket Streets Map
.mpt	Bitmap graphics (Multipage TIFF)
	Template File (MS Project)
.mpv	View file (MS Project)
.mpw	MosASCII Project Workspace file
.mpx	Compiled menu program (FoxPro)
.mrb	Multiple Resolution Bitmap graphics (MS C/C++)
.mrc	MIRC Script file
	Bibliographic Data Format
.mrk	Informative Graphics markup file
.mrs	Macro Resource file (WordPerfect for Win)
.msc	MS C makefile
.msd	MS Diagnostic Utility Report
.msf	Multiple Sequence file
.msg	Message
.msi	Windows Installer file
.msm	MultiSIM Circuit Diagram
.msn	MSN Content Plus file
.mso	Math Script Object file
	MS FrontPage file
	MS Word OLE Web Page Storage Stream
.msp	Bitmap graphics (Microsoft Paint)
.mspx	XML based Web Page
.mss	Manuscript text file (Perfect Writer – Scribble – MINCE – Jove)
.mst	ChemFinder Chemical Structure Index
	DATAIR Pension System Master file
	Minispecification file (Prosa)
	Setup script (MS Windows SDK)
	Visual Test Source file
.msu	Windows Update file
.msv	Sony Memory Stick Format
.msw	Text file (MS Word)
.mswmm	Windows Movie Maker Project
.msx	Compressed CP/M file archive created by MSX
.mtd	Digital Sheet Music
.mth	Math file (Derive)
.mtm	Multitracker Module music
.mts	AVCHD Video file
	Viewpoint iPix file
.mtv	MTV Music Generator
.mtw	Datafile (Minitab)
.mtx	Temporary File often used by a browser or TWAIN device
	Viewpoint iPix file
	Max Magic Microtuner tuning text file
.mu	Menu (Quattro Pro)
.mu3	Myriad Music file (packed sounds & digital tracks)
.muf	ProtoMuck Multi User Forth Program
.mul	Ultima Online Game
.mus	MusicTime Sound file
	Myriad Music file
.mvb	Database
	MS Multimedia viewer file
	MvPCbase www.mvsoft-comp.com
.mvc	Music Collector Collection Manager file
.mvd	MicroDVD (DVD movie file)
.mvf	Stop frame file (AutoCAD AutoFlix)
.mvi	Movie command file (AutoCAD AutoFlix)
.mvw	Log file (Saber LAN)
.mwf	Animation (ProMotion)
.mwp	Lotus Wordpro 97 Smartmaster file
	MegaWorks Pack file
.mws	Maple Worksheet File
.mwv	MovieWorks file
.mxd	GIS Project file
.mxe	Macro Express
	Mindex Effect Album
.mxf	Material eXchange Format for the interchange of audio-visual
	Material with associated data and metadata.
.mxl	Moxcel Spreadsheet File
.mxm	MS Project/Outlook Team Assign Task
.mxp	Macromedia Extension Manager
	ArcReader Published Map
.mxt	Data (MS C)
.myp	Presentation (MM Make Your Point)
.myr	Myriad Music file
.mys	Myst Saved Game
.myt	Myriad Tutorial file
.mzp	Maxscript Compressed File

.na2	Netscape Mail file
.nam	MS Office Name file
.nap	Naplps file (VideoShow) (EnerGraphics)
.nav	MSN Application Extension
.nb	Text file (Nota Bene)
.nbf	Backup Now Backup file
.nbu	Nokia PC Suite Backup file
.nc	Graphics (netcdf)
	Instructions for NC (Numerical Control) machine (CAMS)
.ncb	MS Developer Studio file
.ncc	Cnc (Computer Numeric Control) control file (CamView 3D)
.ncd	Nero CoverDesigner Document file
	Norton Change Directory support file (Norton Commander)
	NTI CD-Maker file
.ncf	Lotus Notes Internal Clipboard
	Steam Configuration file
	Netware Command file
.nch	Outlook Express folder file
	On Hold message/music file
.nd5	NDS Renamed file
.ndb	Network database (Intellicom – Compex)
.nde	Video format – various manufactures of surveillance camera systems
.ndf	NeoPlanet Browser File
.ndk	Lotus Notes(containing the files related to workspace)
.ndx	Index file (dBASE II – III – IV – dBFast)
.neb	Nortec H.E.L.P.
.ned	MSN Application Extension
.nef	Nikon’s RAW format for digital cameras (Nikon Electronic Format)
.neo	Raster graphics (Atari Neochrome)
.nes	Nintendo Entertainment System ROM Image
.net	Network configuration/info file
.new	New info
.nfo	Info file
.ng	Online documentation database (Norton Guide)
.ngf	Enterasys Networks NetSight generated format file
.ngg	Nokia Group Graphics
.nh	NetHack file
.nib	Adobe AIR file
.nif	NetImmerse File Format
.njb	Photo Index file
.nlm	Netware Loadable Module
.nls	Code Page National Language Support
.nlx	Form (FormWorx 3.0)
.nmd	SwordSearcher file
.nmi	SwordSearcher file
.nmo	Virtools Behavioral Objects
.nms	Numega Softice’s Loader file
	Virtools Graphical Scripts
.nnb	newnovelist Story Outline
.nob	VersaPro Word Exchange file
.nol	Nokia Operator Logo
.not	Acrobat Spelling file
	ActiveNote Post-It-Notes
.now	Text file
.np	Project schedule (Nokia Planner) (Visual Planner 3.x)
.npa	ReliaSoft Weibull++ 6
.npf	Backup Now Image file
.npi	Source for DGEN.EXE intepreter (dBASE Application Generator)
.nra	Nero Audio-CD Compilation
.nrb	Nero CD-ROM Boot Compilation
.nrg	Norton Registration Entries
	Nero CD-Image
	IsoBuster file
	NRG File Format
.nri	Nero ISO CD-ROM compilation
.nrl	iManage file
.nrw	Nero WMA Compilation file
	Nikon RAW file
.nsc	Noder file (Polish)
	Windows Media Station file
.nsf	Lotus Notes / Domino database
.nsi	Nullsoft Install System Script
.nst	Music (NoiseTracker)
.nt	Startup files (Windows NT)
.ntf	Lotus Notes / Domino template file
.nth	Nokia Theme file
.ntp	Neato CD Labels
.ntr	Executable ASCII text file (strip header and rename) (netrun31.zip)
.nts	Tutorial (Norton)
	Executable ASCII text file (strip header and rename) (netsend1.zip)
.ntx	Index (Clipper 5)
.ntz	InVircible Directory Integrity Information
.nu4	Norton Utilities Root File (DLL) Symantec Corporation
.nuf	Message for new users on their 1st call (Procomm Plus)
.numbers	iWork Numbers Spreadsheet file
.nup	Program Component Update files
.nvc	Nero Vision Project file
.nvm	AOLpress Help file
.nwc	Noteworthy Composer song file
.nws	Info text file (latest news) (ASCII)
.nwr	New World Report Aegis/MSP Law Enforcement Records (New World Systems)
.nwt	New World Text Aegis/MSP Law Enforcement Records (New World Systems)
.nxt	Sound (NeXT format)
.nzb	NewsBin Index file

.o	Object file (unix – Atari – GCC)
.o$$	Outfile (Sprint)
.oaz	Fax (NetFax Manager)
.ob	Object cut/paste file (IBM LinkWay)
.obd	MS Office Binder
.obj	Object code (Intel Recolatable Object Module)
.obr	Object browser data file (Borland C++)
.obs	Script (ObjectScript)
.obv	Visual interface (ObjectScript)
.oca	Control Typelib Cache
.ocf	Object Craft File (Object Craft)
.ocm	AOL Advertising Control files
	Internet Odyssey 2 Update
.ocp	Advanced Art Studio
	Offline Commander Project file
.ocr	Incoming fax transcribed to text (FAXGrapper)
.oct	Radiance Octree Format
.ocx	OLE ActiveX custom control
.odf	Open Document Interchange
	BattleZone Cartographers Guild file
	Star Trek Armada Ship/Structure Infomation
.odg	OpenDocument Graphic file
.odl	Type library source (Visual C++)
.odp	OpenOffice Presentation file
.ods	OpenOffice Spreadsheet file
.odt	OpenOffice OpenDocument text document
.oeb	Outlook Express Backup Wizard
.oem	TextSetup OEM file
.ofc	Open Financial Connectivity file
.ofd	Form definition (ObjectView)
.off	Object File Format vector graphics
.ofm	Adobe font
.oft	MS Outlook Item Template
.ofx	Olicom Fax
	Open Financial Exchange file
.ogg	Ogg Vorbis Codec Compressed WAV file
.ogm	Ogg Vorbis Compressed Video file
.ogv	Video Container file
.okt	Music (Oktalizer)
.olb	Object library (VAX)
.old	Backup file
.ole	Object Linking and Embedding Object
.oli	Text file (Olivetti)
.oma	OpenMG Music file
.omf	Open Media file
.omg	OpenMG Jukebox
.oms	Briggs Softworks Order Maven
	Macintosh MP3 Music Format
	Omega Downloader Configuration file
.ond	Lotus Notes-related file
.one	OneNote Document File
.ont	Bible file
.oom	Swap file (Shroom)
.opd	Omnipage file
.opf	Flip Album file
	Open Packaging Format file
.opl	Psion Organiser Programming Language Source file
.opn	Active options (Exact)
.ops	Microsoft Office profile settings file
.opt	Optimize support file (QEMM)
.opw	Organization chart (Org Plus for Windows)
.opx	Inactive options (Exact)
.or2	Lotus Organizer 2 file
.or3	Lotus Organizer 97 file
.or4	Lotus Organizer file
.or5	Lotus Organizer file
.ora	Parameter file (Oracle)
.org	Calendar file (Lotus Organizer)
.osd	Open Software Description file
.oss	MS Office Saved Search
.ost	Microsoft Outlook Offline file
.otf	Open Type Format
.otl	Outline font description (Z-Soft Type Foundry)
.otx	Text file (Olivetti Olitext Plus)
.out	Output file
.ov1	Overlay file (part of program to be loaded when needed)
.ov2	Overlay file (part of program to be loaded when needed)
.ovd	Datafile (ObjectVision)
.ovl	Overlay file (part of program to be loaded when needed)
.ovr	Overlay file (part of program to be loaded when needed)
.ovw	Cool Edit Pro Overviewfile
	Cubase .WAV File Image
	DIANA Overview file
.ows	Web Studio 2 Project file
.oxt	Open Office Extension file

.p	Pascal source code file
	Rea-C-Time application parameter file (ReaGeniX code generator)
	Picture file (APPLAUSE)
.p16	Music (16 channels) (ProTracker Studio 16)
.p22	Patch file (Patch22)
.p65	Adobe Pagemaker v6.5
.p7m	PKCS #7 MIME Message
.pa	Print Artist
.pa1	Worktable (PageAhead)
.pab	Microsoft Outlook personal address book
.pac	Stad Image (graphics ?)
	Package (SBStudio II)
.pack	Pack 2000 Compressed file
.pad	Keypad definition (Telemate)
.paf	PARIS audio format
	Personal Ancestral file
.pages	Pages document
.pak	Compressed file archive created by PAK (pak251.exe)
.pal	Adobe Pagemaker Library Palette
	Color Palette
	Compressed File
	Tree Professional Palm Creator file
.pan	Printer-specific file (copy to coreldrw.ink) (CorelDRAW)
.par	Parts application (Digitalk PARTS)
	Parameter file (Fractint)
	Permanent output file (Windows 3.x)
.pas	Pascal source code file
.pat	Hatch patterns (AutoCAD – Photostyler)
	Vector fill files (CorelDRAW)
.pax	Pax Archive file
.pb	Fax (FAXability Plus)
	Phonebook (WinFax Pro)
	Setup file (PixBase)
.pb1	Document (First Publisher for Windows)
.pba	Powerbasic BASIC source code (Genus)
.pbd	Phone book (FaxNOW! – Faxit)
.pbf	Turtle Beach Pinnacle Bank file
	Grand Prix Legends BMAP file
	PBook E-book Format (renamed ZIP file)
	Portable Bitmap Format file
.pbi	Powerbasic include file (Genus)
	Profiler Binary Input (MS Source Profiler)
.pbk	Microsoft XP Remote Access Phonebook file
.pbl	Powerbasic library (Genus)
.pbm	Pbm Portable Bit Map graphics
	Planar bitmap graphics (XLib)
.pbo	Profiler Binary Output (MS Source Profiler)
.pbr	Microsoft Publisher backup file
.pbt	Profiler Binary Table (MS Source Profiler)
.pc	Text file containing IBM PC specific info
.pc3	Custom palette (Harvard Graphics 3.0)
.pc8	Ascii text IBM8 character set (NewWave Write)
.pca	Cash Register Express program
.pcb	Broderbund Print Shop Business Card
	Ivex Winboard Design file
	MS PowerPoint Application Data file
	Protel Technology Advanced PCB Design
.pcc	Cutout picture vector graphics (PC Paintbrush)
.pcd	Graphics (Kodak PhotoCD)
	Microsoft Visual Test compiled script
.pcf	Profile Configuration file
	Profiler Command File (MS Source Profiler)
.pch	Patch file
	Precompiled header (MS C/C++)
.pcj	Multimedia authoring tool graphics (IBM’s Linkaway-Live)
.pck	Received Package file
	Pickfile (Turbo Pascal)
.pcl	HP-PCL graphics data (HP Printer Control Language)
.pcm	Plasmacam CAD/CAM system file
.pcs	PICS Animation
.pct	Bitmap Graphic
	Honeywell GUS Display Builder
	Macintosh Quickdraw/PICT Drawing
	NIST IHDR
.pcw	Text file (PC Write)
.pcx	Bitmap graphics (PC Paintbrush)
.pd	SynerGEE Stoner software files (compressible pipe flow program)
.pda	Bitmap graphics
.pdb	Data (TACT)
.pdc	Personal Database Creator file
.pdd	Adobe PhotoDeluxe Image
.pde	Principalm Data Extract files
	Processing Environment text files
.pdf	Adobe Portable Document Format
	Package Definition File
	Graphics file (ED-SCAN 24bit format)
.pdg	Printshop Deluxe files
.pdl	Project Description Language file (Borland C++ 4.5)
.pdr	Port or printer driver
.pds	Incredimail
	Source Code File
	Telsis HiCall Program File
	Pds graphics
	Planetary Data System
	Pldasm source code file (hardware assembly)
	Print Shop Graphic
.pdt	ProCite Primary Database
	VersaPro Compiled Block
.pdv	Printer driver (Paintbrush)
.pdw	Document (Professional Draw)
.pdx	Adobe Acrobat Index file
.pe4	Photo Explorer Thumbnail
.pea	PeaZip Compressed FileArchived files
.peb	Program Editor bottom overflow file (WordPerfect Library)
.ped	Program Editor delete save (WordPerfect Library)
.pem	Program Editor macro (WordPerfect Library)
	Privacy Enhanced Mail Certificate file
.peq	Program Editor print queue file (WordPerfect Library)
.per	Program Editor resident area (WordPerfect Library) (vakioalue)
.pes	Program Editor work space file (WordPerfect Library)
.pet	Program Editor top overflow file (WordPerfect Library)
.pf	Windows Prefetch file
	Monitor/printer profile file
.pfa	Type 3 font file (unhinted PostScript font)
.pfb	Type 1 PostScript font file
.pfc	Text file (First Choice)
.pfg	jEEPers file
.pfk	Programmable function keys (XTreePro)
.pfl	Family Lawyer Data file
.pfm	Windows Type 1 font metric file
.pfs	Database (PFS:FILE) – text file (PFS:Write)
.pft	Printer font (ChiWriter)
.pg	Pagefox File
	Page cut/paste file (IBM LinkWay)
.pgi	Printer Graphics File device driver (PGRAPH library)
.pgm	Portable Grayscale bitMap graphics
	Program (Signature)
.pgp	Support file (Pretty Good Privacy RSA System)
.pgs	Manual page (man4dos)
.ph	Optimized .goh file (Geoworks)
	Perl header file
	Phrase-table (MS C/C++)
.phb	NewLeaf PhraseBook
	ClustaW Tree file
	TreeView file
	PhoneB Phonebook file
.phn	Phone list (UltraFax – QmodemPro)
.php	PHP Script
	MS Picture It! Publishing Project File
	PhotoParade
.pho	Phone database (Metz Phone for Windows)
.phr	Phrases (LocoScript)
.phtml	PHP Script
.pic	Pixar picture file (SDSC Image Tool)
	Bitmap graphics (Macintosh b&w PICT1 – color PICT2)
	Bitmap graphics (many eg. Lotus 1-2-3 – PC Paint)
.pif	Program Information File (Windows 3.x)
	Vector graphics GDF format (IBM mainframe computers)
	Shortcut to MS-DOS program
.pim	PIM Archive file
.pip	Personalized menu and toolbar (MS Office)
.pit	Compressed Mac file archive created by PACKIT (unpackit.zoo)
.pix	Alias image file (SDSC Image Tool)
.pj64	Project 64 game files.mswmm Windows Movie Maker Project file
.pj	Project (CA-SuperProject)
.pjt	Project memo (FoxPro)
.pjx	Project (FoxPro)
.pk	Packed bitmap font bitmap file (TeX DVI drivers)
.pk3	American McGee Alice Archive
	Return to Castle Wolfenstein file
	Heavy Metal: F.A.K.K.2 Archive
	Quake 3 Arena Archive (renamed zip file)
.pka	Compressed file archive created by PKARC
.pkd	Top Secret Crypto Gold file
.pkg	Installer script (Next)
.pkk	Private Key file
.pkt	Packet Tracer Network Simulation file
.pl	Perl source code file
	Prolog source code file
	Property List font metric file (TeX)
	Palette (Harvard Graphics)
.pl1	Room plan (3D Home Architect)
.pl3	Chart palette (Harvard Graphics 3.0)
.plb	Library (FoxPro)
.plc	Add-in file (functions – macros – applications) (Lotus 1-2-3)
.pll	Pre-linked library (Clipper 5)
.pln	Spreadsheet (WordPerfect for Win)
.plr	Descent Pilot file
	Player file
.pls	DisorderTracker2 Sample
	WinAmp MPEG PlayList file
	Shoutcast file
	MYOB Data file
.plt	AutoCAD HPGL Vector Graphic Plotter file
	Bentley’s CAD MicroStation Driver Configuration for Plotting
	Clipper 5 Pre-linked Transfer file
	Gerber Sign-making Software file
	HP Graphics Language
.pmv	Pegasus Mail Filter Rule file
.pmx	Pegasus Mail file
.pn3	Printer device driver (Harvard Graphics 3.0)
.pnf	Precompiled Setup Information (Temporary file seen during installs)
.png	Bitmap graphics (Portable Network Graphics)
.pnm	Pbm Portable aNy Map (PNM) graphics
.pnt	Macintosh painting
	Qwk reader pointer file (MarkMail 2.x)
.pod	OPENPROJ Project file
.poh	Optimized .goh file (Geoworks)
.poi	Point of interest file
.pop	Messages index (PopMail)
	Pop-up menu object (dBASE Application Generator)
.pos	ProCite Output Styles
	QuickPOS IIF file
.pot	PowerPoint template
.potx	PowerPoint Open XML Template file
.pov	Raytraced scene description file (Persistence Of Vision)
.pow	Chord chart (PowerChords)
.pp	Free Pascal Source Code file
	Compressed Amiga file archive created by POWERPACKER
.ppa	PowerPoint Add-in
.ppb	Button bar for Print Preview (WordPerfect for Win)
.ppd	PostScript Printer Description (Acrobat)
.ppf	Turtle Beach Pinnacle Program file
	Jasc Paint Shop Pro 7 Preset file
	Micrografx Picture Publisher file
	PlayStation Patch file
.ppg	MS PowerPoint Ppresentation
	Professor Franklin’s Photo Print Gold
.ppl	Polaroidpaletteplus ColorKey device driver (Harvard Graphics 3.0)
.ppm	Portable Pixel Map graphics
.ppo	Pre-processor output (Clipper 5)
.ppp	Publication (PagePlus)
	Image files used in PagePlus SE
.pps	PowerPoint Slideshow
	Storyboard (Personal Producer)
.ppsx	MS Office PowerPoint Slide Show file
.ppt	General file extension (PowerPoint)
.ppz	PowerPoint Packaged Presentation
.pqa	Palm Query Application File (database for wireless access)
.pqi	Power Quest Drive imaging
.pr2	Presentation (Aldus Persuasion 2.x)
.pr2	Printer driver (dBASE IV)
.pr3	Postscript printer driver (dBASE IV)
	Presentation (Aldus Persuasion 3.x)
.prc	Corel Presentation file
	Palmpilot resource file
	Picture Gear Pocket
.prd	Printer driver (many)
.pre	Presentation (Freelance Graphics)
	Settings (Programmer’s WorkBench – MS C/C++)
.prf	Pixel Run Format graphics (Improces – Fastgraph)
	Printer driver (dBASE IV)
	Profiler output
.prg	Program (Atari)
	Program source (dBASE IV – FoxPro – Clipper 5 – dBFast)
.pri	Printer definitions (LocoScript)
.prj	Project
.prm	Parameters
	MYOB Premier file extension
.prn	DataCAD Windows Printer file
	HP Printer Control Language
	PostScript file
	Printer Text file
	XYWrite Printer Driver
.pro	Prolog source code file
	Graphics profile file (DOS)
.prs	Printer Resource eg. fonts (WordPerfect for Win)
	Presentation (Harvard Graphics Win)
	Procedure (dBASE IV)
.prt	CADKEY Part file
	Printer Configuration
	Printer driver (Dr.Halo)
	Printer-formatted file
	Pro/ENGINEER Model file
	Process Revolution Template file
	SCEdit Part file
	Unigraphics Part file
.prx	Windows Media Settings file
	Compiled program (FoxPro)
.prz	Freelance Graphics 97 file
.ps	PostScript file (text/graphics) (ASCII)
.ps2	PostScript Level 2 file
.psb	Pinnacle Sound Bank
	Project Scheduler Configuration file
.psd	Adobe Photoshop file
	Design II for Windows
.pse	Bitmap graphics (IBM printer Page SEgment)
.psf	Photoshop Proof Settings file
	Outline PostScript printer font (ChiWriter)
	PrintShop Mail Favorites
.psi	PSION A-law Audio
	File extenstion for Pierresoft Adesign Image
.psm	Music (MASI – ProTracker)
	PrintShop Mail
	Symbol table of IDE (Turbo Pascal)
.psmdoc	PrintShop Mail
.psp	PaintShop Pro Image
	Procedure (Prodea Synergy)
	Project Scheduler Planning file
.psr	Project Scheduler Resource file
.pst	MS Outlook personal folder
.psw	WinXP Backup Password File
.pt3	Device driver (Harvard Graphics 3.0)
	Template (PageMaker 3)
.pt4	Template (PageMaker 4)
.ptb	Script (PubTech BatchWorks)
.ptm	Macro (PubTech BatchWorks)
	An extension used in PUNCH! home design software
	Polynomial Texture Map
.ptn	PaperPort Thumbnail Images
.ptp	Act! Modem Sync file
.ptr	Qwk reader pointer file (QMail)
.pts	Infinity Engine Game Tileset
	Halflife Map Creation Debug file
.ptx	Real Legal E-Transcript
.pub	Page template (MS Publisher)
	Public key ring file (Pretty Good Privacy RSA System)
	Publication (Ventura Publisher – 1st Publisher)
.put	Compressed file archive created by PUT (put334.zip)
.puz	Across Lite Crossword Puzzle
	Packed MS Publisher file
.pva	Hauppauge DVB-Software
.pvd	Script (Instalit)
.pvm	Parallel Virtual Machine software library
.pvl	Library (Instalit)
.pvt	Local Fidonet pointlist
.pw	Text file (Professional Write)
.pwd	Pocket Word document
	AutoCAD Password file
.pwf	ProCite Workforms
.pwi	Pocket Word document
.pwl	Password List
.pwm	WebMoney Purse file
.pwp	Text document (Professional WritePlus)
.pwz	MS Powerpoint Wizard
.px	Primary database index (Paradox)
.pxl	Pocket Excel Spreadsheet
.pxv	Modelworks Project File used in JPad Pro and SitePad Pro
.py	Python script file
.pyc	Compiled PYTHON script file
.pyd	Binary Python Extension on Windows
.pyw	Python GUI Script on Windows
.pz2	Curious Labs Poser Pose file
.pz3	Curious Labs Poser Document
.pza	MGI PhotoSuite II/III/4 Album file
.pzd	Default settings (Pizazz Plus)
.pzl	Jigs@w Puzzle
	Lode Runner Game Puzzle
	Puzzle
.pzo	Overlay file (Pizazz Plus)
.pzp	MGI PhotoSuite II/III/4 Project file
	Palette (Pizazz Plus)
.pzs	Settings (Pizazz Plus)
.pzt	Transfer file (Pizazz Plus)
.pzx	Swap file (Pizazz Plus)

.q05	Intuit Canada Quick tax file, tax return file
.q9q	BladePro Graphic Plugin file
.qad	QuickArt database
.qag	Quick Access Group (Norton Desktop)
.qap	Application (Omnis Quartz)
.qbb	QuickBooks for Windows Backup file
.qbe	Saved query (Query By Example) (dBASE IV – Quattro Pro)
.qbk	Intuit Canada Quick tax file, backup copy of tax return file
.qbl	Business Lawyer Document
.qbo	Compiled query (dBASE IV)
.qbr	QuickBooks Report
.qbw	Spreadsheet (QuickBooks for Windows)
.qcn	Qualcomm Phonebook file
.qcp	Qualcomm PureVoice File
	Contains data frames generated by QCELP 13K vocoder
.qd0	Data file – segment 10 (Omnis Quartz)
.qd1	Data file – segment 1 (Omnis Quartz)
.qd2	Data file – segment 2 (Omnis Quartz)
.qd3	Data file – segment 3 (Omnis Quartz)
.qd4	Data file – segment 4 (Omnis Quartz)
.qd5	Data file – segment 5 (Omnis Quartz)
.qd6	Data file – segment 6 (Omnis Quartz)
.qd7	Data file – segment 7 (Omnis Quartz)
.qd8	Data file – segment 8 (Omnis Quartz)
.qd9	Data file – segment 9 (Omnis Quartz)
.qdat	Quicktime Installer Cache
.qdb	Quicken data file
.qdf	Quicken for Windows data file
.qdt	Quark Xpress Dictionary file
	Question Mark Designer Test file
	QuickBooks UK Accountancy Data file
	Quicken Data file
.qdv	Graphics (Steve Blackstock Giffer)
.qe4	Kingpin Project file
.qef	Query file (Q+E for MS Excel)
.qel	Quicken Electronic Library file
.qfl	Quicken Family Lawyer file
.qfx	Quicken Financial Exchange file
	Fax (QuickLink)
.qhf	QIP PDA History file
.qic	Backup set for Microsoft Backup
.qif	Quicken Interchange Format
	Quicktime Image
.qix	NovaStar Backup file
	Quicken for DOS v.2 data file
.qlb	Quick library (MS C/C++)
.qlc	Data (PostScript help file) atmfonts.qlc
.qlf	Family Tree Maker Genealogy file
.qlp	Printer driver (QuickLink)
.qm4	Options or services file (QMail 4.x Mail Door)
.qm	Virtual Box Language file
.qml	Quick Markup Language file
.qph	Intuit Quicken Price History file
.qpr	Generated query program (FoxPro)
	Print queue device driver (OS/2)
.qpw	Quattro Pro Project file
.qpx	Compiled query program (FoxPro)
.qrp	QuickReport Report files
	Centura Report Builder file
	Liberty for Windows report file
.qrs	Equation Editor support file (WordPerfect for Win)
.qrt	Qrt ray tracing graphics
.qru	SQL Query file
.qry	Query (dBASE IV)
.qsd	Quicken for Windows data file
.qsi	Quintessential Stereotaxic Injector Commander log files
.qst	Quake Spy Tab file
.qt	Quicktime movie (animation)
.qtc	Incite Media Assistant file
.qtk	Apple QuickTake file format for Windows
.qtl	Quick Time Media Link file
.qtp	QuickTime Preferences
	Astra Quicktest Report
.qts	Macintosh PICT image
	QuickTime image
.qtx	QuickTime image
.que	CuteFTP Queue file
	Task Scheduler Queue Object
.qvm	Quake file
.qvs	Casio Digital Camera file
.qw	Symantec Q&A Write file
.qwk	QWK reader message file
.qxd	QuarkXPress document file format
.qxl	Element library (QuarkXPress)
.qxp	QuarkXPress project file
.qxt	Template file (QuarkXpress)

.r	Ratfor (FORTRAN preprosessor) file
.r33	Train Simulator Game file
.r8	Raw graphics (one byte per pixel) plane one (PicLab)
.r8p	Pcl 4 bitmap font file (Intellifont)
.ra	Music (RealAudio)
.ram	Ramfile (RealAudio)
.rar	Compressed file archive created by RAR (rar1_402.exe)
.ras	Sun Rasterfile graphics
.rat	Datafile (RATS)
.raw	Raw RGB 24-bit graphics
.rb	Ruby on Rails class file
.rbf	Windows Installer Rollback file
	Datafile (Rbase)
.rbn	Richard’s Bridge Notation
	Real Sound file
.rbs	Windows Installer Rollback Script file
.rbx	Format for playing RapidPlayer v3.0 ActiveX Control in Explorer
.rc	Resource script (Visual C/C++ – Borland C++)
	Configuration (emacs)
.rcf	Rhapsody Storage file
.rcg	Netscape newsgroup file (netsc.rcg)
.rcp	Recomposer’s MIDI Sequencer Music file
.rcx	Lego Mindstorms Robotics Invention System
.rdb	TrueVector Rules database
	ZoneAlarm Rules database
.rdf	Compiled UIC source code (Geoworks UI Compiler)
.rdi	Device-independent bitmap file (RIFF RDIB format)
.rds	Ray Dream Studio file
.rdx	Datafile (Reflex)
.rec	Datafile (EpiInfo)
	Record file (Sprint)
	Recorded macro file (Windows 3.x)
.red	Path info (Clarion Modula-2)
.ref	Cross-reference
.reg	OLE Registration (Windows 3.x)
	Registration (Corel programs)
.rels	Microsoft Office 2007 Relationships
.rem	Encrypted Data file
	Remarks
.rep	QWK reader reply file
	Report (Report Designer – CodeReporter – DataBoss)
.req	Request
.res	Compiled resource (MS C/C++ – Borland C++)
	Dbase resources (dBASE IV)
.rev	Revision file (Geoworks)
.rex	Rexx source code file
.rex	Report definition (Oracle)
.rez	Resource file
.rf	Sun raster graphics
.rfl	Roll Forward Log file
.rft	Dca/RFT Revisable Format Text file (IBM DisplayWrite 4.0-5.1)
.rgb	Sgi RGB image file (SDSC Image Tool)
.rgi	RealArcade Game Installer
.rgp	RealArcade Game Package
.rgs	RealArcade Game Installer
.rgx	Symbol tables etc. info (ReaGeniX code generator)
.rh	Resource header file (Borland C++ 4.5)
.rhp	Rhapsody Notation Program File Format
.ri	Data (Lotus 1-2-3)
.rib	Graphics in Renderman format (3DReality)
.ric	Fax (Ricoh)
.rif	Riff bitmap graphics (Fractal Design Painter)
.rip	Graphics (Remote Access)
.rix	Bitmap graphics (ColorRIX VGA Paint)
.rl4	Bitmap graphics
.rl8	Bitmap graphics
.rla	Wavefront raster image file (SDSC Image Tool)
.rlb	Data (Harvard Graphics Win) hgw.rlb
.rlc	Graphics 1bit/pixel scanner output
.rle	Utah Run Length Encoded raster graphic (SDSC Image Tool)
.rlz	Realizer source code file (CA-Realizer)
.rm	RealMedia file
.rmf	Rich Map Format
	Rich Music format
.rmi	Midi file (RIFF RMID format)
.rmj	Real Jukebox file
.rmk	Makefile (Clipper RMake)
.rmm	RealPlayer file
.rmr	Resume Maker file
.rms	Secure Real Media file
.rmvb	Video file for Realplayer
.rm	RealMedia
.rmvb	Real Media video file
.rmx	RealJukeBox MP3 file
.rn	Xpl program for Nota Bene users
.rnd	Rendering Slide (AutoCAD AutoShade)
.roi	Actuate ReportBlast file
.rno	Runoff file (VAX)
.rol	Fm music Adlib Music File (Roland)
.rpd	Database (RapidFile)
	RosaPro file
	RPV Printing System file
.rpl	Text document (Replica)
.rpm	RedHat Package Manager
	RealMedia Player file
	RunPaint Multicolor Graphic
.rps	Propellerhead Software Reason Song
.rpt	Report
.rrd	ERDAS Imagine file
.rs	Data file (Amiga Resource – Reassembler)
.rs_	Resource fork of a Macintosh file (Mac-ette)
.rsb	Red Storm Image Format
.rsc	Resource file
.rsm	ReliaSoft MPC 3
	RuneSword II Game
	WinWay Deluxe Resume file
.rsp	Response file
.rss	Rockwell Logix PLC file
.rst	ANSYS Results
	ReliaSoft BlockSim
.rsw	ReliaSoft BlockSim
.rtc	Live Meeting Connection file
.rtf	Rich Text Format text file (many – Windows Word)
	Windows Help file script
.rtl	Run Time Library (NU 7.0)
	Text file
.rtp	Turbo Tax Update file
	RTPatch software update package data file
.rts	Runtime library file (CA-Realizer)
.rtx	Reliacast Audience Manager Turnstile
	Mobile Phone Ringtone
.ru	JavaSoft Library file
.rul	InstallShield
.run	RunScanner Saved file
.rv	RealVideo Video file
.rvb	Rhinoscript file
.rvp	MS Scan Configuration file
.rvw	Review
.rwg	Random Word Generator List file
.rws	Resource Workshop data file (Borland C++)
.rwx	Script (RenderWare)
.rwz	MS Outlook Rules Wizard file
.rzk	Red Zion File Crypt (password file)
.rzr	in-sync Speed Razor Project file
.rzx	in-sync Speed Razor Project file
	Red Zion File Crypt (encrypted file)

.s	Assembly source code file (Unix)
	Scheme source code file
.s$$	Temporary sort file (Sprint)
.s3m	Music (16 channels) (Scream Tracker 3.0)
.sac	Shared Asset Catalog (Adobe)
.saf	MusicMatch Jukebox Secure Audio file
	Safe File Encryption (Helix Software)
	Twelve Ghosts file
.sah	SETI@Home data file
.sal	Datafile (SORITEC)
.sam	Text file (Samna – Lotus Ami/Ami Pro)
.sar	Compressed file archive created by SAR (sar1.zip)
.sas	SAS System program
.sas7bcat	SAS System file catalog
.sas7bdat	SAS System data set
.sas7bndx	SAS System index
.sas7bpgm	SAS System Stored Program
.sas7bvew	SAS Data Set View
.sas7mdb	SAS System multidimensional database
.sat	Standard ACIS Text file
.sav	Backup file (saved file)
	Configuration
	Saved game situation (eg. NetHack)
.sb	Audio file (signed byte)
.sbc	Sagebrush Corporation Spectrum CIRC/CAT Report
.sbd	Storyboard (Storyboard Editor)
.sbi	Sound Blaster Instrument file (Creative Labs)
.sbj	Micrografx Clipart or Palette file
.sbn	ArcView file (GIS)
.sbp	Dml program (Superbase 4)
.sbr	Support file (Source Browser)
.sbs	SWAT HRU Output file
.sbt	Notes related to record (Suberbase 4 Windows)
.sbx	ArcView file (GIS)
.sc	Pal script (Paradox)
	Display driver (Framework II)
.sc3	Renamed dBASE III screen mask file (dBASE IV)
	Screen device driver (Harvard Graphics 3.0)
.sca	Datafile (SCA)
.scc	Text file
.scd	Scodl Scan Conversion Object Description Language graphics
.scf	Multimedia show (ScoreMaker)
	Spelling checker configuration (Symphony)
	Windows Explorer command file
.sch	Project schedule (Schedule Publisher)
	Schematics file (ORCAD)
.sci	System Configuration Information
	Fax (SciFax)
.scm	Scheme source code file
	ScreenCam Movie file
	SchematicMaker file
.scn	Screen file (Kermit)
	Pinnacle Studio Scene file
.sco	High score
.scp	Script (BITCOM)
.scr	Debug source code file (DOS Debug)
	Screen – screen snapshot (dBASE IV – Procomm Plus)
	Screen font (LocoScript)
	Screen saver (Windows 3.x)
	Script (Kermit – 1st Reader)
.sct	Screen memo (FoxPro)
	Windows Script Component
.scx	Bitmap graphics (ColorRIX)
	Chart (Stanford Chart)
	Screen (FoxPro)
.scy	Security file (ReaGeniX)
.sda	Fidonet’s Software Distribution Network file archive description
.sdc	StarOffice Spreadsheet
.sdd	StarOffice Presentation
.sdf	System Data Format file (fixed lenght ASCII text)
.sdi	Software Distribution Network Info file
	Single Document Interface file
.sdn	Software Distribution Network compressd file archive (pak251.exe)
.sdr	SmartDraw file
.sds	Chart Application Document file
.sdt	SmartDraw Template
	Dungeon Keeper 2 Archive
	Theme Park World Archive
.sdu	Edwards Systems Technology file
.sdw	StarOffice Text
	Raw Signed DWord Data
	Lotus WordPro Graphic
.sea	Self-Extracting compressed Macintosh file Archive
.sec	CyberPaint animation file (sequence)
	Secret key ring file (Pretty Good Privacy RSA System)
	Secured animation file (Disney Animation Studio)
.sed	Self Extraction Directive file
.sep	Printer separator page
.seq	Atari animation file
	Sequential Instruction File (Bubble Chamber)
.ses	Session info (Clarion Modula-2)
.set	Configuration (1st Reader)
	Driver sets created by Install (Symphony)
	Setup options file
.sf	Ircam Sound File (CSound package – MixView sound sample editor)
	Wps attribute storage (OS/2 WorkPlace Shell) wp_root.sf
.sf2	Creative Labs Soundfont file
.sfb	HP Soft Font file
.sfc	System File Checker file
.sff	Fritz Fax-Print file
	Stage Scene file
	Structured Fax Format
.sfi	Graphics (SIS Framegrabber)
	Printer font (HP LaserJet landscape) (Ventura Publisher)
.sfl	Pcl 4 bitmap font (landscape) (Intellifont) (Ventura Publisher)
.sfn	Font (SPX)
.sfo	CuteFTP Search file
.sfp	Pcl 4 bitmap font (portrait) (Intellifont) (Ventura Publisher)
.sfs	Pcl 5 scalable font file (Intellifont)
.sft	Screen font (ChiWriter)
.sfv	QuickSFV/WinSFV Checksum file
	Simple File Verification (Easy SFV Creator)
.sfw	Seattle Film Works file
.sfx	Self Extracting Archive file
.sg1	Graphics (Stanford Graphics)
.sgf	Document with graphics (Starwriter)
	Smart Game Format
	Sonique Skin
.sgi	Graphics (IRIS – Silicon Graphics)
.sgm	Standard Generalized Markup Language file
	Run-Time Help Files
	SoftQuad XMetaL File
.sgn	Sierra Print Artist Sign
.sgp	Statistics (STATGRAPHICS Plus)
.sgt	Save/get keyboard macro (Signature)
.sh	Unix shell script
	Unix ASCII file archive created by SHAR (unshar.zip)
.sh3	Presentation (Harvard Graphics 3.0)
.sha	Shell Archive file
.shb	Background (CorelShow)
.shd	Microsoft Windows Shadow file
	Print Spooler Shadow file
.shg	Segmented-graphics bitmap
.shk	Compressed Apple II file archive created by SHRINKIT
.shm	Shell macro (WordPerfect Library)
.shn	Shorten audio compression file
.shp	Shape file and source file for text fonts (AutoCAD)
.shr	Unix ASCII file archive created by SHAR (unshar.zip)
.shs	Microsoft Word or Excel scrap file which is created when you drag and drop selected text
.shtml	HTML File with Server Side
.shw	Presentation (Harvard Graphics 2.0 – CorelShow)
	Slide show (WordPerfect Presentations)
.shx	Shape entities (AutoCAD)
.sid	Commodore64 Music file
	LizardTech MrSID Photo
.sif	Setup Installation Files info (Windows NT Setup)
.sig	Current program settings (Signature)
	PrintShop Sign file
	Signature file (PopMail)
.sik	Backup file (Sicherungskopie) (MS Word)
.sim	Aurora
	PC Finder 2002C
	PowerDVD file
	Simulation (various)
.sis	SymbianOS Installer file
.sit	Compressed Macintosh archive created by STUFFIT (unsit30.zip)
.sitx	Stuffit SITX Compressed File
.skb	SketchUp software file (3D Design Tool)
.skf	Autosketch file
.skin	Skin file
.skm	Google Sketchup Texture file
.skn	Interface skins images (FileWrangler, SecurDesk!, SecurDesk! LV, ZipWrangler)
	Symbian OS Skin File
.skp	Sketchup software component (3D Design Tool)
.sl	S-Lang source code file
.slb	Slide library (AutoCAD)
.slc	Compiled SALT script (Telix)
.sld	Slide (AutoCAD)
.slf	BitDefender file
	Symantec Licence file
.sli	Slide (MAGICorp Slide Service)
.slk	Sylk Symbolic Link format data file (MultiPlan)
.sll	Sound data file
.sln	Microsoft Visual Studio Solution file
.slt	Salt Script Application Language for Telix script source (Telix)
.sm	Smalltalk source code file
	Maillist (SoftSpoken Mailer)
	Script (ScriptMaker)
	Text file (Samna Word)
.smc	Super Nintendo Game-console ROM Image
.smd	StarOffice Mail
.smf	Fax (SMARTFAX)
.smi	RealPlay SMIL file
	Self Mounting Image file
.smil	Synchronized Multimedia Integration Language file
.smk	Compressed File (Smacker)
.smm	Macro (Ami Pro)
.smp	Sample (sound file)
.sms	Microsoft Package Definition file
	Sega Master System Emulator
.smt	Text file (Smart Ware II)
.smtmp	SMTMP Virus
.snd	Digitized sound file (Macintosh/ATARI/PC)
.sng	Song (midi sound) (Midisoft Studio – Prism)
.snm	Netscape mail
.sno	Snobol4 source code file
.snp	CoffeeCup HTML Editor Snippet
	Computer Eyes Video Output
	Microsoft Access Report Snapshop file
	Snapview Shapshot
.snx	Mirage Microdrive Snapshot Extended Version
	Second Nature Software Graphic
	StarCraft Saved file
.so	Apache Module file
.sol	Flash shared object file
	Solution eg. game walkthroughs
.som	Network serial numbers (Quattro Pro)
	Sort information (Paradox)
.son	Song (SBStudio II)
.sou	Sound data (sound tool)
.sp	Compressed file archive created by SPLINT (unix)
.spa	Macromedia FutureSplash file
	Smart Protocol Analyzer Real Time Communication Data
	SmartPA Saved Capture file
	Thermo Nicolet OMNIC file
.spc	Program (MS Multiplan)
	Temporary file (WordPerfect for Win)
	Super Nintendo SPC700 sound file
.spd	Scalable font (Speedo) (Harvard Graphics 3.0)
.spf	Slide presentation file (EnerGraphics)
.spg	Glossary (Sprint)
.spi	Graphics (Siemens and Philips scanner)
.spi	InConSoft Ltd. Sim-Path system files
.spl	Compressed file archive created by SPLINT (splint.arc)
	Customized printer driver (Sprint)
	Personal spell dictionary (Signature)
	Microsoft Windows Print Spool file
	Sample
.spm	Data (WordPerfect) wp{wp}.spm
.spo	Statistical Program (SPSS)
.spp	Printer file (Sprint)
.spr	Document letter (Sprint)
	Genarated screen program (FoxPro)
	Sprite
.sps	Spssx source code file (VAX/VMS)
	Screen driver (Sprint)
.spt	Spitbol source code file
	Support file (MITAC disk/system management utility pack)
.spv	InConSoft Ltd Sim-Path vehicle file
.spw	Worksheet (SigmaPlot)
.spx	Compiled screen program (FoxPro)
.sql	SQL report or query
.sqlite	SQLite Database file
.sqm	Service Quality Monitoring file
	Logfile for Windows Live Messenger
.sqz	Compressed file archive created by SQUEEZE (sqz1083e.exe)
.src	Source (DataFlex)
.srf	Sun Raster File graphics
	Sony RAW Image file
.srp	Script (QuickLink)
.srt	BSplayer Subtitle file
	Omron CX-Supervisor
	SDR99 Speech Recognition Task Speech Recogniser Transcript
.ss	Bitmap graphics (Splash)
.ssa	Subtitles
.ssb	SmartSync Pro
.ssd	Datafile (SAS/PC)
.ssf	Snagit file
	Enable Spreadsheet file
.ssm	RealPlayer Standard Streaming Metafile
.ssp	Datafile (SAS Transport)
.st	Smalltalk source code file (Little Smalltalk)
	Instrument library (Scream Tracker)
	Stamp (NeoPaint)
.st3	MIDI Karaoke file
.sta	Adobe Photoshop Match Colour Image Statistics file
	Saved state (Reflection 4.0)
	Stack (Spinmaker Plus)
.stb	Stub library (Genus GX Kernel)
.std	State Transition Diagram graphic file (Prosa)
	Standard (something..) (LocoScript)
.stf	Compressed file archive created by SHRINKTOFIT
.stg	ActiveSync (Microsoft) Backup file
	Statistica Graphics File
.stl	C++ Standard Template Library
.stm	State Transition Diagram model file (Prosa)
	Music (Scream Tracker)
.stn	ArcView Geocoding Standardization file
	STiNG file
.sto	Pascal stub OBJ file (Genus GX Kernel)
.stp	Sharepoint Web Site Template File
	PageKeeper Packed Storage file
	DART Pro 98 system settings
	AP203 Step file
.str	Structure list object file (dBASE Application Generator)
.sts	Project status info (MS C/C++)
	Song format (Scream Tracker)
.stt	Automap Template
	SureThing CD Labeler Template file
.stu	Tarantella Enterprise 3 3270 Emulator Style file
	xyALGEBRA file
.stw	Data file (SmartTerm for Windows)
.stx	Electronic book (SmarText)
	Tax form (CA-Simply Tax)
.sty	Style library or sheet (many text and graphics programs)
.sub	CloneCd related file
.sui	Suit library (Simple User Interface Toolkit)
.sum	Summary
.sun	Sun rasterfile graphics
.sup	Supplementary dictionary (WordPerfect for Win)
.sv4	RollerCoaster Tycoon Saved Game
.svd	Autosave file for document (MS Word)
.svg	Autosave file for glossary (MS Word)
	Scalable Vector Graphics File format
.svgz	Compressed Scaleable Graphic file
.svp	WISCO Survey Power
	Sonique Visual Plugin file
	SwiftView Command file
.svs	Autosave file for style sheet (MS Word)
.sw	Audio file (signed word)
.swd	Storybook file
	Sabiston Textbook
.swf	ShockWave Flash object
.swg	Swag packet (SWAG Reader)
.swi	Swish Data file
.swk	Swapkeys Keyboard File
.swp	Document backup (Sprint)
	Swap file (DOS)
.sxc	StarOffice / OpenOffice Spreadsheet file
.sxw	OpenOffice.org Writer 6.0 text file
	StarOffice Word Document file
.sy1	Smartpix symbol library (Ami Pro)
.sy3	Symbol file (Harvard Graphics 3.0)
.syd	Backup of startup files created by QEMM (?) autoexec.syd
.sym	Precompiled headers (Borland C++)
	Program symbol table (many compilers and linkers)
	Symbol file (Harvard Graphics 2.0)
.syn	Sdsc Synu image file (SDSC Image Tool)
	Synonym file (MS Word 5)
.sys	Datafile (SYGRAPH – SYSTAT – SPSS/PC)
	System file – device driver or hardware configuration info (DOS)
.syw	Graphics symbols (Harvard Graphics Win)
.szc	Windows Mobile 5 (Pocket PC)

.t	Tads source
	Tape Archive (tar) without compression
	Tester symbol table (ReaGeniX code generator)
	File extension for a Turing open source file
.t$m	AVG Internet Security Temporary file
.t04	TaxCut 2004 file
.t05	TaxCut 2005 Tax Return
.t06	TaxCut 2006 Tax Return
.t07	TaxCut 2007 Tax Return
.t08	TaxCut 2008 Tax Return
.t09	H&R Block At Home 2009 Tax Return
.t10	H&R Block At Home 2010 Tax Return
.t11	H&R Block At Home 2011 Tax Return
.t12	H&R Block At Home 2012 Tax Return
.t2	Textease 2000 file
.t44	Temporary file for Sort or Index (dBASE IV)
.t64	Program (C64S emulator)
.ta0	TaxAct file
.tab	Guitar Tablature file
	MapInfo Table
	Diabetes Mentor file
.tag	Query tag name (DataFlex)
.tah	Turbo Assembler Help file (Borland C++)
.tal	Text illustration (TypeAlign)
.tao	IsoBuster file
.tar	Compressed file archive created by TAR (pax2exe.zoo)
.tax	TurboTax file
.taz	Compressed ASCII file archive created by TAR and COMPRESS (.tar.Z)
.tb1	Font file (Borland Turbo C)
.tb2	Font file (Borland Turbo C)
.tbf	Fax (Imavox TurboFax)
.tbh	Mah Jongg for Windows Tile Set
.tbk	Memo backup (dBASE IV – FoxPro)
	Toolbook (Asymetrix ToolBook)
.tbl	Graphics (native format) (Adobe PageMaker TableEditor)
	Table of values (OS/2)
.tbs	Text elements ?? (Textbausteine) (MS Word)
.tbx	Table (Project Scheduler 4)
.tc	Configuration (Turbo C – Borland C++)
.tch	Turbo C Help file (Borland C++)
.tcl	Tool Command Language source code (Swat)
.tcp	3D Topicscape (exported inter-Topicscape topic link)
.tcw	Drawing (TurboCAD for Windows)
.td	Configuration file (Turbo Debugger for DOS)
.td0	Disk image file (Teledisk)
.td2	Configuration file (Turbo Debugger for Win32)
.tdb	Database (TACT)
	eBay Turbo Lister file
.tdf	Font (TheDraw)
	Typeface definition file (Speedo)
.tdh	Help file (Turbo Debugger)
.tdk	Keystroke recording file (Turbo Debugger)
.tds	Symbol table (Turbo Debugger)
.tdt	ASCII Data File in CSV Format
	Daylight Fingerprint Data file
	Thor Datatree file
.tdw	Configuration file (Turbo Debugger for Windows)
.tee	TeeChart Office graphic
.tef	Fax (Relisys TEFAX)
.tel	Host file (Telnet)
.tem	Turbo Editor Macro Language script (Borland C++)
	Input template (IconAuthor)
.temp	Temporary file
.test	Test File Extension
.tex	LaTeX Source Document file
	Tex text file (Scientific Word)
	Datasheet (Idealist)
.text	ASCII Text file
.tf	Configuration (Turbo Profiler)
	Configuration (TinyFugue)
.tfa	Area file (Turbo Profiler)
.tfc	Catalogue file (Tobi’s Floppy Cataloguer)
.tfh	Help file (Turbo Profiler)
.tfm	Tex Font Metric file (TeX)
	Tagged font metric file (Intellifont)
.tfs	Statistics (Turbo Profiler)
.tfw	ArcView World File For TIF Image
	Digital Raster Graphic World
.tg1	Project file (On Target)
.tga	Truevision Targa bitmap graphics
.tgz	Compressed file archive created by TAR and GNUzip (.tar.gz)
.thb	KinuPix Skin
.thd	Thread
.thm	Thumbnail Image file
	Microsoft Clipart Gallery database
	Serif DrawPlus Theme
.thn	Graphics Workshop for Windows Thumbnail
.ths	Thesaurus dictionary (WordPerfect for Win)
.tib	Acronis True Image file
.tif	Tagged Image File Format bitmap graphics (PageMaker – CorelDRAW)
.tiff	Tagged Image File Format
.til	Fuzzy logic knowledge base (Togai InfraLogic Fuzzy-C Compiler)
.tim	Playstation Game Texture Image
	The Incredible Machine Level File
.tis	Tile set (MahJongg 3.0)
.tix	ASA for UNIX Terminfo Extension file
	DivX file
	Hybrid Graphics file
	Tix Widgets
.tjl	Backup file (VAXTPU editor)
.tlb	OLE Type Library
	Reference table (Bubble Chamber)
	Text library (VAX)
	Type library (Visual C++)
.tlc	Compiled Tool Command Language source code (Swat)
.tlp	Project (TimeLine)
.tlt	Trellix Web Design file
.tmb	Timbuktu Pro Connection Document
.tmd	Document (TextMaker)
.tmf	Tagged Font Metric file (WordPerfect for Win)
.tmo	Ztg global optimizer default output file (Zortech C++)
.tmp	Temporary file
.tmpl	eMule Web Interface Template file
.tmq	TestMaster file
.tms	Script (Telemate)
.tmv	Template (TextMaker)
.toc	Table Of Contents
	PSP Audio file
.tol	Kodak Photoenhancer
.TOPC	TopicCrunch project file for saving and resubmitting SEO searches
.tos	Self-extracting file archive (Atari ST)
.tp	Configuration (Turbo Pascal)
	Session-state file (Turbo Profiler)
	GUI template file for components written in C (Ternion)
.tp3	Template (Harvard Graphics 3.0)
.tpb	Downloadable PCL Soft font file backup (HiJaak)
.tpf	Downloadable PCL Soft font file (HiJaak)
.tph	Help file (Turbo Pascal)
.tpi	Microsoft Test file
.tpl	Document Template file
	Resident units library (Turbo Pascal)
	Template (Harvard Graphics 2.0)
.tpp	Protected Mode Units (Borland Pascal 7.0)
	Teleport Pro Project file
	GUI template file for components written in C++ (Ternion)
.tps	Clarion for Windows data file
.tpu	Turbo Pascal Unit (BGI) (Turbo Pascal)
	Command file (VAXTPU editor)
.tpw	Session-state file (Turbo Profiler for Windows)
	Turbo Pascal Unit (BGI) (Turbo Pascal for Windows)
.tpz	Compressed file archive created by TAR and GNUzip (.tar.gz)
.tr	Session-state settings (Turbo Debugger for DOS)
	Man page input suitable for troff -man (cawf2.zip)
.tr2	Session-state settings (Turbo Debugger for Win32)
.trace	ECXpert Debugging file
	TcpDump Output file
	Telcordia Software Visualization and Analysis Toolsuite
	WebSTAR Mail Server Error file
	Zope 3 Strace Log
.trc	Debug support file (Power CTrace)
.tre	Directory tree file (PC-Tools)
.trg	Symantec LiveUpdate file
.tri	Trigram file
.trk	Kermit Script file
	Mixman Studio Track
	Train Dispatcher Railroad Centgralized Traffic Control Simulation
	Magellan “MapSend”- series GPS ‘track’ data file
.trm	Terminal settings (Windows 3.x)
.trn	Translation support file (Quattro)
.trp	Tripmaker file
	High Definition Video Transport Stream file
.trs	Executable file (Micrografx)
.trw	Session-state settings (Turbo Debugger for Windows)
.trx	Router Firmware file
	Emerald PC Authorize Batch Transaction file
.ts	Transport Stream file
.tsk	Skins for Pocket PC PDAs
	PhotoImpact Quick Command
.tsp	Windows Telephony Service Provider
.tst	Printer test file (WordPerfect for Win)
.tsv	Tab Separated Value file
.tt10	Turbotax 2010 Return file
.tta	The True Audio Codec file
.ttc	OpenType font file
.ttf	Truetype Font file
.tub	PaintShop Pro Tube file
.tut	Tutorial
.tv	Table view settings (Paradox)
.tv1	Overflow file above insert point in Doc 1 (WordPerfect for Win)
.tv2	Overflow file above insert point in Doc 2 (WordPerfect for Win)
.tv3	Overflow file above insert point in Doc 3 (WordPerfect for Win)
.tv4	Overflow file above insert point in Doc 4 (WordPerfect for Win)
.tv5	Overflow file above insert point in Doc 5 (WordPerfect for Win)
.tv6	Overflow file above insert point in Doc 6 (WordPerfect for Win)
.tv7	Overflow file above insert point in Doc 7 (WordPerfect for Win)
.tv8	Overflow file above insert point in Doc 8 (WordPerfect for Win)
.tv9	Overflow file above insert point in Doc 9 (WordPerfect for Win)
.tvf	Table view settings (dBASE)
.tvo	TeveoLive
.tvp	NVIDIA Graphic Card Update file
.tvr	Navicat for MySQL file
.tvt	RealPlayer
.txd	Grand Theft Auto 3 Texture file
	Letters Direct
.txf	Compressed file archive created by TAR and FREEZE (.tar.f)
.txi	Support file (TeX)
.txl	Genesis3D Texture file
.txt	Text file
.tym	Time Stamp (PageMaker 4)
.tz	Compressed file archive created by TAR and COMPRESS (.tar.Z)
.tzb	Compressed file archive created by TAR – COMPRESS – BTOA (.tar.Z.btoa)

.uax	Unreal Audio file
.ub	Audio file (unsigned byte)
.uc2	Compressed file archive created by UltraCompressor II (uc2.zip)
.ucn	New compressed file archive created by UltraCompressor II
.ucs	Universal Classification Standard Database file
.udc	Acrobat Spelling file
.udf	Filter (Photostyler)
.udl	MS Data Link
.uds	Sierra Generations Family file
.ue2	Encrypted file archive created by UltraCompressor II
.ufo	Ulead PhotoImpact Graphic file
.uha	UHARC Compressed Archive file
.uhs	Universal Hint System (binary file)
.ui	Espire source code file (Geoworks UI Compiler)
	User interface (Sprint)
.uif	MagicISO Disc Image file
	Long prompts for windows (WordPerfect for Win)
.uih	Espire header file (Geoworks UI Compiler)
.uis	WindowBlinds (Copyright Neil Banfield & Stardock.net, Inc.)
.ul	Ulaw audio file
.uld	Information about uploaded files (Procomm Plus)
.ult	Music (UltraTracker)
.umb	Backup file (MemMaker)
.umd	Universal Media Disc file
.umf	Stockmoves, MOTEK BV
.umx	Unreal music file
.uni	Unimod music module (MIKMOD)
	Datafile (Forecast Pro)
.unl	Garmin Unlock file
.unq	Fax View file
.uns2	Ultra Notes Backup file
.unx	Text file containing UNIX specific info
.upd	Program update info
	Update data (dBASE)
.upg	Firmware Upgrade file
.upo	Compiled update data (dBASE)
.upx	ULead Photo Express Saved Image file
.url	Uniform Resource Locator (Internet shortcut)
.urls	GetRight URL List file
.usb	D-Link FM Radio Update
	USB Protocol Analyzer Trace
.user	Visual Studio User Options file
.usp	Printer font with USASCII extended character set (PageMaker)
.usr	User database file (Procomm Plus – Turbo C++ tour)
.utf	AOL Updating Files
.utl	Sound file
.utx	Unreal Engine Texture file
	Unicode file
.uu	Compressed ASCII file archive created by UUDE/ENCODE
.uue	Compressed ASCII file archive created by UUENCODE (uuexe515.exe)
.uvf	CSV (comma separated value) format. Used by Netica
.uvr	Ulead Cool 360 Viewer file
.uw	Audio file (unsigned word)
.uwl	WordPerfect User Word List file

.v	Consistency check support file (ReaGeniX code generator)
	Main input file for an image (Vivid 2.0)
.v2	Microsoft Live Messenger data file
.v64	Nintento 64 Emulation ROM Image
.val	Validity checks and referential integrity (Paradox for Windows)
	Values list object file (dBASE Application Generator)
.van	Animation (VistaPro)
.var	Variable file (IconAuthor)
.vbc	Visual Business Cards
.vbd	ActiveX file
.vbe	VBScript Encoded Script file
.vbn	Norton Corporate anti-virus quarantined file
.vbp	Visual Basic Project file
.vbs	Visual Basic Script file (Visual Basic)
.vbw	Visual Basic Project Workplace (Visual Basic)
.vbx	Visual Basic eXtension (Visual Basic)
.vc	Include file with color definitions (Vivid 2.0)
	Spreatsheet (VisiCalc)
.vc4	Virtual CD/DVD Image file
.vcd	VisualCADD Drawing file
	Video CD format
.vce	Visual CE Class Type file
.vcf	VCard file
.vch	Interlock Public Computer Utility
.vcmf	VAIO Content Metadata file
.vcs	vCalender file
.vcw	Visual workbench information (MS Visual C++)
.vcx	Spreatsheet (VisiCalc Advanced)
.vda	Bitmap graphics
.vdb	Norton AntiVirus Corporate Edition Update file
	PC-cillin Quarantined file
.vdf	Avira AntiVir virus definition file
	Vexira Anti-virus virus definition file
.vdi	Virtual Disk Images files
.vdj	Virtual DJ Sample file
.vdm	VDM Play
.vdr	Drawing (ComputerEasy Draw)
.vdx	XML for Visio Drawing file
	Vector Graphic file
	Virtual Device Driver
.vem	VeePro Embroidery Software Format
	Voice E-mail file
.ver	Version Description file
.vew	View file (Clipper 5, Lotus Approach)
.vfm	Voting Form (Voter)
.vfn	Voting Form for Customers (Voter)
.vfp	TMPGEnc VFAPI Plug-in
.vfs	Virtual File System Index
.vfx	Ulead Video Studio Sample file
.vga	Vga display driver
	Vga display font
.vgd	Vga display driver (Generic CADD)
.vgr	Graphics (Ventura Publisher)
.vhd	Virtual Hard Disk file
.vi	Graphics (Jovian Logic VI)
.vic	Vicar graphics
.vid	Video file
	Ms-DOS Shell Monitor file (MS-DOS 5)
	Bitmap graphics (YUV12C M-Motion Frame Buffer)
	Screen device driver (Word)
.vif	Khoros Visualization image file (SDSC Image Tool)
.vik	Viking graphics
.vir	Virus Infected file
.vis	Vis graphics
.viv	VivoActive Player Video file
.vlm	Ashlar-Vellum file
	Novell Virtual Loadable Module
	Vellum CAD Drawing
.vlt	WinVault Container file
.vm	Virtual Memory file (Geoworks)
.vm1	Panasonic SD Voice Editor file
.vmc	Virtual memory configuration (Acrobat reader)
.vmdk	VMware Image file
.vmf	Font characteristics (Ventura Publisher)
	Voice mail file (VocalTec Voice)
.vmg	Text Message files
.vml	Vector Markup Language
.vmo	Mobile Phone voice file (Siemens Sl45)
	Virtools Behavioral Server Composition (Web-based Protected Format)
	Cosmopolitan Virtual Makeover File
.vmp	Logos Library System 2.x Verse Map
.vms	Text file containing VMS specific info
.vmt	Valve Material file. Details how a material is to be rendered
.vmx	VMware Configuration file
.vnt	vNote file
.vo	Include file with object definition (Vivid 2.0)
.vob	DVD video movie file
.voc	Digitized samples (Creative Voice file)
.vof	Object folder (VZ Programmer)
.vol	VOL Archive file
	Tribes 2 game file
	Earth Siege 2 Archive
	Giants: Citizen Kabuto Archive
	Tribes Archive
	Tribes Extreme Archive
.vor	OpenOffice.org Template
.vox	Vox Audio
	Dialogic ADPCM
	Talking Technology Inc. file
	Natural MicroSystmes Voice file
.vp6	TrueMotion VP6 Video file
.vpa	Excite Chat Gestures file
.vpd	Virpet Performance Descriptor
	VitaGraph file
.vpg	Graphics (VPGraphics)
.vpk	Steam Package Archive file
.vpl	Karaoke Player Playlist file
	Virtual Property List file
.vpp	Virtual Pool Game
	Red Faction/Summoner Package file
.vqe	Yamaha Sound-VQ Locator File
.vqf	Yamaha Sound-VQ File
.vql	Yamaha Sound-VQ Locator File
.vrd	VRScape data file
.vrm	Overlay file (QuattroPro)
.vro	Panasonic DVD Recorder file
.vrp	Project (WATCOM VX?Rexx)
.vrs	Video Resource eg. video device driver (WordPerfect)
.vs	Include file with surface definition (Vivid 2.0)
.vsd	Diagram (Shapeware Visio)
.vsl	GetRight Download List file
	Visio Library
.vsm	Simulation model (VisSim)
.vsp	Visual Studio file
	Sprite (SPX)
	Backup Exec 9.1 and higher
.vss	Smartshapes file (Shapeware Visio)
.vst	Truevision Vista bitmap graphics
.vtf	Valve Texture file. Used to store texture data
.vts	DVD File format
.vtx	XML for Visio template file
.vue	Animation (3D Studio)
	View (dBASE IV – FoxPro)
.vw	Text file (Volkswriter)
.vw3	Text file (Volkswriter 3)
.vwl	VideoWave Video Wave Library
.vwr	File viewer file (PC Tools)
.vwt	VideoWave Thumbnail
.vxd	Virtual device driver (MS Windows)
.vyd	VyperHelp

.w	Database AppBuilder Source Code file
	Word chart file (APPLAUSE)
.w02	Multiple Archive file
.w30	Printer font (AST TurboLaser) (Ventura Publisher)
.w31	Startup file (Windows 3.1)
.w3g	Warcraft III file
.w3m	Warcraft III Map file
.w44	Temporary file for Sort or Index (dBASE)
.w5v	Winamp file
.wab	Outlook File
.wac	Infinity Game Engine WAVC Sound
.wad	Doom Game file
	Gunman Chronicle Archive
	Half Life Archive
	Heretic Archive
	Hexen Archive
	Quake Archive
	Theme Park World Archive
.waf	Mayim’s WAF Compiler file
.wal	Winamp Skin file
	WalMaster Showlist file
.war	Java Web Archive (used by Servlets)
	Konqeror HTML page archive
.wav	Waveform audio file (RIFF WAVE format)
.wax	Windows Media Player Redirect file
.wb1	Notebook (Quattro Pro)
.wb2	Spreadsheet (Quattro Pro)
.wb3	Quattro Pro for Windows
.wba	WindowBlinds Compressed Skin
	Winace Zip file
.wbc	Webshots Picture Collection
.wbf	Ms Windows Batch File (Catch)
.wbk	Document/workbook (WordPerfect for Win)
.wbmp	Wireless Application Protocol Bitmap file
.wbt	Batch file (WinBatch)
.wbx	Webigger file
.wbz	WebShots file
.wcd	Macro token list (WordPerfect for Win)
.wcm	Data transmission file (MS Works)
	Macro (WordPerfect for Win)
.wcp	Product information description (WordPerfect for Win)
.wd2	Info Select for Palm Organizer file
	WordExpress Document
.wdb	Database (MS Works)
.wdf	ReliaSoft Weibull 5.0
	Workshare DeltaView DeltaFile
.wdl	Windows XP Watchdog Log file
.web	Web source code file
.wer	Microsoft Windows Error Report file
.wfc	Windows Connect Now file
.wfm	Form object (dBASE Form Designer)
.wfn	Font (CorelDRAW)
.wfx	Data file (Winfax)
.wg1	Worksheet (Lotus 1-2-3/G)
.wg2	Worksheet (Lotus 1-2-3 for OS/2)
.wgt	Opera Widget file
.wid	Width table (Ventura Publisher)
.wim	Image Format file
.win	Opera Saved Window file
	Window file (FoxPro – dBASE)
	Wonderware InTouch window file
.wiz	Page wizard (MS Publisher)
.wjp	WildTangent Branded .jpg file
.wk1	Spreadsheet (Lotus 1-2-3 version 2.x – Symphony 1.1+)
.wk3	Spreadsheet (Lotus 1-2-3 version 3.x)
.wk4	Spreadsheet (Lotus 1-2-3 version 3.4)
.wkb	Document (WordPerfect for Win)
	Workbook file
.wke	Spreatsheet (Lotus 1-2-3 educational version)
.wkq	Spreatsheet (Quattro)
.wks	Spreadsheet (Lotus 1-2-3 version 1A – Symphony 1.0 – MS Works)
	Workspace (Xlisp)
.wll	Word Add-in
.wlk	Graphics (Virtus Walkthrough)
.wlt	eWallet file
	WaveL Wavelet Compressed Graphic
	Words of Worship Liturgy
.wma	Microsoft Active Streaming file
.wmc	Backup of startup files by Windows MathCad autoexec.wmc
	Macro file (WordPerfect for Win)
	Text file (WordMARC)
.wmf	Windows MetaFile vector graphics
.wml	Wireless Markup Language
.wmv	MS Active Streaming file
.wmz	Windows Media Compressed skin file
.wn	Text (NeXT WriteNow)
.wnf	Outline font description (CorelDRAW native format)
.wo4	STABCAL file
.wo7	STABCAL file
.woa	Swap file (Windows 3.x)
.woc	Microsoft Office 2007 Organization file
	Organization (Windows OrgChart)
.wor	MapInfo Workspace
.wot	WebEx Saved Meeting Movie
.wow	Music (8 channels) (Grave Mod Player)
.wp	Text file (WordPerfect 4.2)
.wp3	Microsoft Photo Story Project file
.wp5	Document (WordPerfect 5.x)
.wpd	Document (WordPerfect 6.0 – PFS:WindowWorks)
.wpf	Fax (WorldPort)
	Form (WordPerfect)
.wpg	WildTangent Branded .PNG file
	Wordperfect Graphics vector graphics (DrawPerfect)
.wpj	MS Works Projects
.wpk	Macros (WordPerfect for Win)
.wpl	Windows Media Player Playlist file/td>
	Draxy Software Wallpaper Sequencer
	Online WebPanel file
	PFS WinWorks Spreadsheet
	WHAT IF MOL-object
	Words of Worship Playlist
.wpm	Macros (WordPerfect)
.wps	Text document (MS Works)
.wpt	WordPerfect template
	602 pro PC SUITE template document file
.wpw	PerfectWorks document
.wq!	Compressed spreadsheet (Quattro Pro)
.wq1	Spreadsheet (Quattro Pro)
.wr1	Spreadsheet (Symphony 1.1 – 1.2 – 2)
.wrd	Template (Charisma)
.wrf	used for WebEx recording. Microsoft office add-in for meeting
.wri	Text file (Windows Write)
.wrk	Spreadsheet (Symphony 1.0, 1.2, 2.0, 3.0)
.wrl	Plain text VRML file
.wrml	Plain text VRML file
.wrp	Compressed Amiga file archive created by WARP
.wrs	Windows Resource eg. printer driver (WordPerfect for Win)
.ws	Text file (WordStar 5.0-6.0)
.wsf	Windows Script file
.wss	Web Screen Saver file (Web Screen Saver 2008)
.ws2	Text file (WordStar 2000)
.wsc	Windows scripting component file
.wsd	Document (WordStar)
.wsf	Windows Script file
.wsh	Windows Script Host Settings file
.wsp	Workspace (Fortran PowerStation)
.wsr	FirstStop WebSearch file
.wss	Web Screen Saver file (Web Screen Saver 2008)
.wst	Text file (WordStar)
.wsx	WinMX Filesharing Program
.wsz	Skin Zip file (WinAmp)
.wtd	WinTune Document file
.wtr	MS Encarta file
.wv	WavPack compressed Audio file
.wve	Component of a DIVX Movie Conversion
	Psion Series 3a/3c/3mx Waveform sound file
.wvx	Metafile
.wvw	Backup Wonderware InTouch window file
.wwb	Button bar for document window (WordPerfect for Win)
.wwk	Keyboard layout (WordPerfect for Win)
.wwp	Worms World Party Teams file
.wws	AutoRoute User Information
.wwv	WildTangent Branded .WAV file
.wxp	Document (EXP for Windows)
.wxs	Easy Cross crosstitch file
.wzg	WZebra file
.wzs	Microsoft Word wizard

.x	DirectX Object file
	AVS X image file (SDSC Image Tool)
	Lex source code file
.x01	Secondary index (Paradox)
.x02	Secondary index (Paradox)
.x03	Secondary index (Paradox)
.x04	Secondary index (Paradox)
.x05	Secondary index (Paradox)
.x06	Secondary index (Paradox)
.x07	Secondary index (Paradox)
.x08	Secondary index (Paradox)
.x09	Secondary index (Paradox)
.x16	Macromedia Program Extension (16-bit)
.x32	Macromedia Program Extension (32-bit)
.xap	Silveright Application Package
.xbel	XML Bookmark Exchange Language file
.xbm	X11 Bitmap graphics
.xcf	Gimp Image file
.xdf	Milnta APL Transfer Function
	Workshare Synergy file
.xdw	X Windows Screen Dump file
.xef	X-Genics eManager – XML form and data for eManager
.xem	X-Genics eManager – Metered units / credit definition for forms/file usage in eManager
.xep	X-Genics eManager – File packaging / unpacking information for eManager components
.xes	X-Genics eManager – XML definition for UI skins
.xet	X-Genics eManager – XML definition for eManager process
.xev	X-Genics eManager – File download definition for auto-update and delivery of new procedures
.xez	X-Genics eManager – Template package for eManager
.xfd	XML Form in XFDL Format
.xfdl	Extensible Forms Description Language file
.xfn	Printer font (Xerox 4045) (Ventura Publisher)
.xft	24 pin printer font (ChiWriter)
.xfx	Fax File (various)
.xhtml	Extensible HyperText Markup Language file
.xi	Fast Tracker 2 Instrument or ScreamTracker Instrument file
.xif	Wang image file
	Often a Fax image (TIFF) file
	ScanSoft Pagis XIF Extended Image Format
	Xerox image file
.xla	Xlib Archive (xlibpas2.zip)
.xla	Add-in macro sheet (MS Excel)
.xlb	Data (MS Excel)
.xlc	Chart document (MS Excel)
.xlk	Excel Backup
.xll	Excel Dynamic Link Library (MS Excel)
.xlm	Macro sheet (MS Excel)
.xlr	MS Works file
.xls	Spreadsheet(MS Works)
	DATAIR Data Import Specification Translation file
	Worksheet (MS Excel)
.xlsm	Microsoft Excel Macro-Enabled Workbook file
.xlsx	Microsoft Excel XML file
.xlt	Template (MS Excel)
	Translation table (Lotus 1-2-3 – Symphony – Procomm Plus)
.xlw	Workbook (MS Excel)
.xlx	XoloX Incomplete Download file
.xm	Music (Fast Tracker)
.xmi	Compressed eXtended MIdi music
.xml	Extensible Markup Language file
.xmp	Extensible Metadata Platform
.xnf	Standard Network File form
.xpi	XPInstall File
	Digital surveillance system
.xnk	Microsoft Exchange Shortcut
.xpl	Music file
.xpm	X11 Pixel Map graphics
.xpr	Memorex CD-ROM label file
.xps	XML Paper Specification file
.xpt	Mozilla Firefox Component file
	XPCOM Type Library
.xpw	Leading Market Technologies EXPO
	Screen-Fillable Surfer Version of a Form
.xqt	Executable file (Waffle)
	Macro sheet (SuperCalc)
.xpv	digital surveillance system
.xrf	Cross-reference file
.xsd	XML Schema file
.xsf	Milnta APL Transfer Function
.xsl	Extensible Stylesheet Language file
.xspf	XML Shareable Playlist file
.xss	Ability Office Spreadsheet
.xtb	External translation table (LocoScript)
.xtm	Xtremsplit Data file
.xtr	MapTool file (an add-on for UI-View)
	Xtreme Tuning files
.xul	XML User Interface Language file
.xvb	WinExplorer VB Script
.xvid	Xvid Video file
.xvl	Compact 3D file format for web apps.(Lattice 3D)
.xwd	X Window System window dump image graphics (SDSC Image Tool)
.xwk	Keyboard mapping (Crosstalk)
.xwp	Session (Crosstalk)
	Text file (Xerox Writer)
.xx	Compressed file ASCII archive created by XXENCODE (uuexe515.exe)
.xxe	Compressed file ASCII archive created by XXENCODE (uuexe515.exe)
.xxx	Singer Sewing Machine Professional SewWare file
	Embroidery Design file
.xy	Text file (XY Write)
.xy3	Text file (XYWrite III)
.xyw	Text file (XyWrite III)
.xyz	ASCII RPG Maker Graphic Format
.xz	XZ Compressed Archive file

.y	Yacc grammar file
	Compressed Amiga file archive created by YABBA
.y01	Secondary index (Paradox)
.y02	Secondary index (Paradox)
.y03	Secondary index (Paradox)
.y04	Secondary index (Paradox)
.y05	Secondary index (Paradox)
.y06	Secondary index (Paradox)
.y07	Secondary index (Paradox)
.y08	Secondary index (Paradox)
.y09	Secondary index (Paradox)
.yab	Yabasic Source Code file
.yal	Data (Arts & Letters)
.ybk	Microsoft Encarta Yearbook file
.ychat	Yahoo! Messenger chat log
.yenc	yEnc file
.ymg	Yahoo! Messenger file
.yml	YAML file
.ync	yEnc Encoded file
.yps	Yahoo! Messenger Data file
.yuv	YUV Encoded Image or Video file
.yz	Compressed file archive created by YAC
.yz1	Yamazaki ZIPPER file

.z	Compressed file ASCII archive created by COMPRESS (comp430d.zip)
	Unix Compressed file archive created by PACK (Unix SysV pack)
.z01	Winzip Split Archive file
.z02	Split Archive file
.z1	ZoneAlarm Renamed VB file
.z3	Infocom game module
.zap	Zero Administration Package file
	FileWrangler Compressed file
	MS Windows Software Installation Settings
.zbd	Canon ZoomBrowser Database file
	MechWarrior 3 Snow Fields file
	Zebedee Encrypted file
.zdb	Zimbra Database File
.zdb
.zdct	After Effects Language file
.zdg	Compressed ZiffNet text document (Zview)
.zdl	Design Pro Label file
.zdp	ZDNet Password Pro 32
.zer	Data file (Zerberus)
.zfx	ZFX – CC3 File Packer Tool
.zgm	Graphics (Zenographics)
.zhtml	Secure IE Zipped HTML file
.zi	Renamed Zip file
.zif	Zooming Image Format file
.zip	ZIP Compressed file archive
.zipx	WinZip Compressed file
.zix	Quicken Data file
	WinZix Compressed file
.zl?	Zone Alarm Mailsafe Renamed File.
	ZoneAlarm quarantines attachments and changes their file names.
	ZoneAlarm Quarantined EXE File (Ex. .EXE to .zl9)
.zl	Zlib Compressed file
.zls	Atlantis Ocean Mind Word Processing file
.zmc	ZoneAlarm Mailsafe
.zom	Compressed Amiga file archive created by ZOOM
.zon	Grand Theft Auto 3 Zone file
.zoo	Compressed file archive created by ZOO (zoo210.exe)
.zpk	Z Firm Package file
.zpl	Creative Zen Micro playlist
.zst	ZSNES Slot 0 Savestate
.ztd	Ziff Davis Media text database
.zvd	Zyxel Voicefile (Z-Fax)
.zvz	Possible Virus file
.zxp	Extension Manager Package
.zz	Zzip Compressed Archive file
.zzt	ZZT Game Creation System

Number Symbol A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Full List

This article was last updated on January 13, 2016

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Data File Formats and File Extensions – Complete List