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Data Formats and File Extensions: A

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.

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  Data File Formats that Begin with the Letter 'A'

.aAda source code file
Library (unix)
.a0?ALZip Split Archive file
.a11Graphics AIIM image file
.a2bA2B Player Playlist
.a3dAmapi 3D Modeling file
.a3mUnpackaged Authorware MacIntosh file
.a3wUnpackaged Authorware Windows file
.a4aAuthorware 4.x Library
.a4mUnpackaged Authorware MacIntosh file
.a4pAuthorware file packaged without runtime
.a4wUnpackaged Authorware Windows file
.a5wUnpackaged Authorware Windows file
.aaAudible Audio file
.aabMacromedia Authorware Binary
.aacAdvanced Audio Coding MPEG-2, MPEG-4
.aamAuthorware shocked file
.aaxAudible Audiobook file
.ab2Parson's Address Book
.ab6Datafile (ABStat)
.ab8Datafile (ABStat)
.abaPalm Address Book file
.abcActionScript Byte Code File
ABC FLOWCHARTER 1.x flowchart
ABC2K Audio/Video Controller Software
.abdAmBiz Bonus Calculator data file
Adventure Builder database
.abfAdobe Binary Font
.abiABI CODER Encryption software
AOL extension: AOL 6 Organizer
.abkAutomatic backup file (CorelDRAW)
.abmImagePals Photo Album Document
Montage Photo Album file
PhotoPlus Album file
.abrAdobe Photoshop brush file
.absAbstracts (info file)
Data file (Abscissa)
MPEG audio sound file
.abwAbiWord document
.abxWordPerfect Address Book file
.abyAOL file (located in AOL program directory)
.ac3AC3 Audio File Format
.acaMicrosoft Agent Character file
Project (Project Manager Workbench)
.acbGraphics (ACMB)
.accProgram (DR-DOS - ViewMax) (GEM / resident)
.acdSonic Foundry Acid music file
.aceAce Archiver / WinAce compressed file
.acfMicrosoft Agent Character file
Adobe Photoshop Custom Filter
.aciACI Development Appraisal
.aclMicrosoft Office Auto Correction file
Document file (Audit Command Language)
ArborText Command Language
.acmAudio Compression Manager Driver
Photoshop command button
Windows system file
ACBM image file
Interplay compressed Sound file
.acornACORN Graphics format
.acsMS Agent Character file
.acs2AIMP2 Media Player Skin file
.acsmAdobe Content Server Message file
.actActor source code file
Foxdoc Action Diagrams (FoxPro)
Presentation (Action!)
.acvOS/2 Audio Drivers
Photoshop Saved Curve
.adScreen saver data (AfterDark)
.adaAda source code file
.adbAda Package Body
.adcBitmap graphics (16 colors) (Scanstudio)
.adeMicrosoft Access Project
.adfAdapter Description file
Admin Config file
Amiga Disk File
Dog Creek QC Mask file
.adiGraphics (AutoCAD)
.adlMca adapter description library (QEMM)
.admAfter 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
.adnAdd-in (Lotus 1-2-3)
.adoPhotoshop Duotone Options
Stata Program
.adpFaxWorks Modem setup file
Astound Dynamite file
MS Access Project
AOLserver Dynamic Page file
.adrAddress Book
Address Plus Database
After Dark Random Screen Saver Module
Opera Web Browser Bookmark file
Smart Address Address Book
.adsAda Package Specification
.adtDatafile for cardfile application (HP NewWave)
Fax (AdTech)
.adxDocument (Archetype Designer)
.adzGZ-Packed Amiga Disk file
.aehiPer Advanced Embedded Hypertext
.aepAdobe After Effects Project file
.aexPGP Armored Extracted Public Encryption Key
After Effects Plugin file
.af2Flowchart (ABC FlowCharter 2.0)
.affAnyForm Form file
.afiTruevision bitmap graphics
.aflFont file (for Allways) (Lotus 1-2-3)
.afmType 1 font metric ASCII data for font installer (ATM - many)
Datafile for cardfile application (HP NewWave)
.afsAdobe Type Manager font set
.aftAnyForm template file
.agApplixware graphics file
.agpAspen Graphics Pages
.agwAspen Graphics Windows
.aiVector graphics (Adobe Illustrator)
.aiffAudio interchange file format
.ainCompressed file archive created by AIN
.aioAPL file transfer format file
.airAdobe AIR Installation Package file
Automatic Image Registration
.aisArray of Intensity Samples graphics (Xerox)
.aixDatafile for cardfile application (HP NewWave)
.ajpJPEG2000 Digital closed-circuit television (CCTV) security camera video format
.albJASC Image Commander Album
Photo Soap2 file
Steinberg Cubase or VST Backup Song file
.albmwebAlbum Photo Album
HP Photosmart Photo Printing Album
.allFormat file for working pages (Always)
General printer information (WordPerfect for Win)
Symbol and font files (Arts & Letters)
.alsAlias Image
Calmira Shortcut file
.altMenu file (WordPerfect Library)
.alxActiveX Layout file
.alzALZip Compressed file
.amfMusic (Advanced Module Format)
.amffAmiga Metafile
.amgCompressed file archive created by AMGC
System image file (Actor)
.ampPhotoshop Arbitrary Map Settings
.amrAdaptive Multi-Rate ACELP Codec
Above audio file extension
.amvAMV Video file
.amxAfter Effects Motion Exchange file
.ancAnimation file format (MorphInk)
.aniAnimation (Presidio - many)
.anmAnimation (Deluxe Paint Animator)
.annHelp Annotations (Windows 3.x)
.ansAnsi graphics (character animation)
Ascii text ANSI character set (NewWave Write)
.aosAdd-On Software (Nokia 9000)
ARCHOS 504 media
.apCompressed Amiga file archive created by WHAP
Datafile (Datalex EntryPoint 90)
Artwork Systems Program (ArtPro)
.apcPrinter driver (Lotus 1-2-3)
.apdPrinter driver (Lotus 1-2-3)
.apeMusic format (different players)
.apfPrinter driver (Lotus 1-2-3)
.apiAdobe Acrobat Plugin file
Passed parameter file (1st Reader)
Printer driver (Lotus 1-2-3)
.apkAndroid Package file
.aplAPL work space format file
.apmArcPad 6 file
.appAdd-in application file (Symphony)
Application object file (dBASE Application Generator)
Executable application file (DR-DOS - NeXTstep - Atari)
Generated application (FoxPro)
.aprEmployee performance review (Employee Appraiser)
.apsMS Visual C++ file
ArcPad 5 Symbology file
.apxAppexpert database file (Borland C++ 4.5)
.arcCompressed file archive created by ARC (arc602.exe/pk361.exe)
Compressed file archive created by SQUASH (squash.arc)
.arfAutomatic Response file
.argAutoCAD Profile Export file
.ariCompressed file archive created by ARI
.arjCompressed file archive created by ARJ (arj241.exe)
.arlAOL Organizer File
.arkArc file archive created by CP/M port of ARC file archiver
Compressed file archive created by QUARK
.arrArrangement (Atari Cubase)
.arsAdobe After Effects Render
.artGraphics (scrapbook) (Art Import)
Raster graphics (First Publisher)
.arvArsiv File
AutoRoute User Information
.arxCompressed file archive created by ARX
.asaMS Visual InterDev file
Active Server Document
.ascAscii text file
Adobe ActionScript Communication file
Transport armor file (PGP)
.ascxMicrosoft ASP.NET user control file
.asdAutosave file (Word for Windows)
Presentation (Astound)
Screen driver (Lotus 1-2-3)
.asfDatafile (STATGRAPHICS)
Screen font (Lotus 1-2-3)
.ashAssembly language header file (TASM 3.0)
.asiAssembler include file (Turbo C - Borland C++)
.aslAdobe Photoshop Layer file
.asmAssembly source code file
Pro/Engineer Assembly file
.asmxMicrosoft .NET Web Service file
.asoAssembler object (object orientated) file (Turbo Assembler)
.aspMicrosoft Active Server Page
Aspect source code file (Procomm Plus)
Association of Shareware Professionals OMBUDSMN.ASP notice
.aspxMicrosoft ASP.NET file
.asrMs Automap Route
Photoshop Scratch Area
.asxMicrosoft Windows Media Active Stream Redirector file
.asxMicrosoft Advanced Streaming Format
.at2Auto template (Aldus Persuasion 2.0)
.atmAdobe Type Manager data/info
.atnAdobe Photoshop Action file
.atrLightscape Material Library
.attAT&T Group 4 Bitmap
.aty3D Topicscape (Exported association type)
.auSound (audio) file (SUN Microsystems)
.au3Autoit3 script file
.audAudio file
.autAutoIt 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
.auxAuxillary references (TeX/LaTeX)
Auxiliary dictionary (ChiWriter)
.avaPublication (Avagio)
.avbInoculan Anti-Virus virus infected file
Microsoft Chat character file
.avdAvery Label Pro Data file
.aviAudio Video Interleaved animation file (Video for Windows)
.avrAudio Visual Research file
.avsAnimation file
Application Visualization System Format
Stardent AVS-X image
Winamp Advanced Visualization Studio file
.avxArcView file
.awText file (HP AdvanceWrite)
Answer Wizard for Microsoft Help
.awbLavasoft Ad-aware backup file
.awdAWD MS Fax
Award BIOS file
AWK Language Source Code file
.aweAdobe Acrobat Bookmark XML file
.awkAwk script/program
.awmMovie (Animation Works)
.awpMicrosoft Fax key viewer
.awrTelsis Digital Audio file
.axDirectShow Filter
.axdAvery Label Pro Re-Index file
Actrix Technical file
.axeParadigm C++ Integrated Debugger file
MS Autoroute export file
.axgMS Autoroute Trip file
.axlArcIMS XML Project file
.axsAMX Axcess control system file format
HTML Active X script
.axtZenWorks snAPPshot ASCII Application Object template
Photoshop Replace Color/Color Range
.axxaxxess files used as backups of Inter-Tel databases
.azwAmazon Kindle eBook File
.azzAZZ Cardfile

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

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