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    IT Management 8 min read

    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.

    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
    .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

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

    This article was last updated on April 12, 2012