Letter A: Data Formats & File Extensions

Find data file formats and file extensions that start with the letter A, or view thousands of file extensions and file formats in the complete list.

With literally thousands of data file formats employed by Windows and Window-based apps, keeping track of all the file extensions employed by your software applications and programs can be quite 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 that Begin with the Letter ‘A’

.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
.ax DirectShow Filter
.axd Avery Label Pro Re-Index file
Actrix Technical file
.axe Paradigm C++ Integrated Debugger file
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

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

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

This article was last updated on April 12, 2012

Webopedia Staff
Webopedia Staff
Since 1995, more than 100 tech experts and researchers have kept Webopedia’s definitions, articles, and study guides up to date. For more information on current editorial staff, please visit our About page.
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