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Data Formats and File Extensions: Complete List

View more than four thousand file extensions and file formats in our complete list of data file formats.

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.

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 75x75 dpi display font (Ventura Publisher)
.085 85x85 dpi display font (Ventura Publisher)
.091 91x91 dpi display font (Ventura Publisher)
.096 96x96 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

Recommended Reading: An Introduction to Data File Formats and Their File Extensions

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