File types with extensions that start with the letter A

File Extention	File Type	Description
.a	Developer	Static Library
.a00	Compressed	ALZip Second Split Archive File
.a01	Compressed	ALZip Third Split Archive File
.a02	Compressed	ALZip Fourth Split Archive File
.a1wish	Data	Audials Wishlist File
.a26	Game	Atari 2600 ROM
.a2b	Audio	Adlib Tracker II Instrument Bank
.a2c	3D Image	Alice Object File
.a2i	Audio	Adlib Tracker II Instrument File
.a2l	CAD	ASAP2 ECU Description File
.a2m	Audio	Adlib Tracker II File
.a2m	Settings	TS-AudioToMIDI Settings File
.a2p	Audio	Adlib Tracker II Pattern File
.a2t	Audio	Adlib Tracker II Tiny Module File
.a2theme	Settings	Aston 2 Theme File
.a2w	Audio	Adlib Tracker II Instrument Bank with Macros
.a2w	Developer	Alice World
.a3d	3D Image	Alternativa Player 3D Export File
.a3l	Data	Authorware 3 Library
.a3m	Data	Authorware 3 Macintosh File
.a3w	Data	Authorware 3 Windows File
.a4l	Data	Authorware 4 Library
.a4m	Data	Authorware 4 Macintosh File
.a4p	Web	A4Desk Pro Project File
.a4w	Data	Authorware 4 Windows File
.a52	Audio	Dolby Digital Audio File
.a52	Game	Atari 5200 ROM
.a5l	Data	Authorware 5 Library
.a5rpt	Data	Alpha Five Project Report File
.a5w	Web	Alpha Five Webpage File
.a5w	Data	Authorware 5 Windows File
.a5wcmp	Data	Alpha Five Web Components File
.a65	Data	Authorware 6.5 File
.a6p	Executable	Authorware 6 Program
.a8s	3D Image	Anim8or Script
.aa	Disk Image	Generic CD Image
.aa	Audio	Audible Audio Book File
.aa3	Audio	ATRAC Audio File
.aac	Audio	Advanced Audio Coding File
.aaf	Video	Advanced Authoring Format File
.aam	Data	Authorware Map File
.aao	Data	Agenda At Once File
.aao	Game	America's Army Map File
.aaui	Plugin	Acrobat User Interface File
.aawdef	Misc	Ad-Aware Definitions File
.aax	Audio	Audible Enhanced Audiobook File
.ab	Data	DNA Sequence File
.ab	Developer	Applix Builder File
.ab	Audio	Ambling BookPlayer MP3 File
.ab	Backup	Android ADB Backup File
.ab1	Data	DNA Electropherogram File
.ab2	Data	Print Shop Address Book File
.ab3	Data	PhotoImpact 3 Album File
.aba	Backup	Palm Address Book Archive
.aba	Plugin	Avant Browser Add-on File
.abbu	Backup	Address Book Backup
.abc	Developer	ActionScript Byte Code File
.abc	Developer	ABC Source File
.abc	Audio	ABC Music Notation
.abc	Vector Image	Micrografx ABC FlowCharter 6 File
.abcd	Data	AudioVisual Book Data File
.abcddb	Database	Apple Address Book Contact List
.abdata	Data	Adobe Bridge Data File
.abf	Font	Adobe Binary Screen Font File
.abf	Backup	Analysis Services Backup File
.abi	Data	DNA Chromatogram File
.abi	Plugin	AbiWord Plug-in
.abk	Game	Arena Opening Book File
.abk	Game	Need for Speed Underground Audio File
.abk	Backup	Automatic Backup File
.abkprj	Data	Ashampoo Backup Project
.abm	Raster Image	Photo Album
.abm	Audio	Music Album
.abp	Data	AVS Barcode Profile
.abr	Misc	Adobe Photoshop Brushes File
.abs	Game	AB SuDoKu Saved Game
.abs	Settings	Avant Browser Skin File
.abs	Database	Absolute Database File
.abs	Settings	TurboZIP Auto Compress Script
.abw	Text	AbiWord Document
.aby	Data	AOL Address Book File
.ac	Executable	Autoconf Script
.ac$	Misc	AutoCAD Temporary File
.ac3	Audio	Audio Codec 3 File
.ac5	Vector Image	ArtCut 5 Document
.ac6	Vector Image	ArtCut 6 Document
.aca	Data	Agent Character Animation File
.acb	Settings	Adobe Photoshop Color Book File
.acb	Settings	AutoCAD Color Book File
.acb	Misc	AOL Cab Launcher
.acbl	Settings	Adobe Color Book Legacy File
.acc	Data	Graphics Accounts Data File
.acc	Executable	GEM Accessory File
.accda	Plugin	Access Add-in File
.accdb	Database	Access 2007 Database File
.accdc	Database	Microsoft Access Signed Package
.accde	Database	Access Execute Only Database
.accdr	Database	Access Runtime Application
.accdt	Database	Microsoft Access Database Template
.accdu	Plugin	Access Add-in File
.accdw	Database	Microsoft Access Database Link File
.accft	Database	Microsoft Access Data Type Template
.accountpicture-ms	Raster Image	Windows 8 Account Picture File
.acd	Developer	RSLogix 5000 Program
.acd	Audio	ACID Project File
.acd-bak	Audio	Sony ACID Project Backup File
.acd-zip	Audio	Sony ACID Project With Embedded Media File
.ace	Compressed	WinAce Compressed File
.acf	Game	Steam Application Cache File
.acf	Data	Agent Character Data File
.acf	Settings	Adobe Photoshop Custom Filter File
.acfm	Font	Adobe Composite Font Metrics File
.acg	Data	Agent Preview File
.acg	Data	Audio Comparer Group File
.acl	Misc	AutoCorrect List File
.acm	Audio	Interplay Audio File
.aco	Settings	Adobe Photoshop Color Swatch File
.acorn	Raster Image	Acorn Image
.acp	Backup	Alfresco Content Package
.acp	Audio	aacPlus Audio File
.acp	Developer	EditPlus Auto-Completion File
.acr	Backup	Acer eRecovery Management Backup File
.acr	Data	Audio Comparer Results File
.acr	Raster Image	American College of Radiology File
.acr	Executable	ACRobot Script
.acrobatsecuritysettings	Settings	Adobe Acrobat Security Settings File
.acrodata	Settings	Acrobat Data File
.acroplugin	Plugin	Adobe Acrobat Plug-in
.acs	Misc	Agent Character File
.acsm	eBook	Adobe Content Server Message File
.act	Developer	DS Game Maker Action File
.act	CAD	Alma CAD/CAM Document
.act	Audio	ADPCM Compressed Audio File
.act	Settings	Adobe Color Table File
.act	3D Image	Genesis3D Actor File
.act	Text	FoxPro Documenting Wizard Action Diagram
.action	Executable	Automator Action
.actm	Executable	AutoCAD Action Macro File
.actx	Developer	DS Game Maker Action Description File
.acv	Settings	Photoshop Curves File
.acw	Settings	Windows Accessibility Wizard File
.acx	Game	Atari ST Program
.ad	Misc	After Dark Screensaver
.ada	Developer	Ada Source Code
.adadownload	Misc	Adobe Download Assistant Partial Download File
.adb	Database	Ability Database File
.adb	Page Layout	Now Contact Address Book Template
.adb	Developer	Ada Body File
.adb	Database	Alpha Five Database File
.adblock	Developer	Alpha Five Library Temporary File
.adc	Raster Image	Scanstudio 16 Color Image
.adcp	Data	Adobe Device Central Project File
.add	Misc	Dynamics AX Developer Documentation File
.addin	Developer	Visual Studio Add-in Definition File
.addon	Plugin	CFS Console Add-on File
.ade	Database	Access Project Extension
.adf	Database	ACT! Data File
.adf	GIS	ESRI ArcInfo Binary Grid Format
.adf	Disk Image	Amiga Disk File
.adg	Audio	Ableton Device Group
.adi	Backup	Active@ Disk Image Backup File
.adi	Misc	Dynamics AX Developer Documentation Index File
.adi	CAD	AutoCAD Device-Independent Binary Plotter File
.adm	System	Administrative Template File
.adm	Misc	Portfolio Admin-Level Access Flag
.adml	System	Group Policy Language-Specific Administrative Template
.admx	System	Group Policy Administrative Template File
.adn	Database	Access Blank Project Template
.ado	Settings	Adobe Photoshop Duotone Options File
.adobebridge	Data	Adobe Bridge URL FIle
.adox	Data	ActivDox Document
.adp	Database	Access Project
.adpp	Settings	Adobe Device Profile Package
.adr	Web	Opera Bookmarks File
.ads	Developer	Ada Specification File
.adt	Game	World of Warcraft Map File
.adt	Audio	ADTS Audio File
.adt	Data	ACT! Document Template
.adt	CAD	AutoCAD Audit Log
.adts	Audio	Audio Data Transport Stream File
.adu	Data	Addict User Dictionary File
.adv	Audio	Ableton Device Preset File
.adv	Data	Nortek Acoustic Doppler Velocimeter File
.adv	System	Audio Driver File
.advs	Data	Adobe Device Central Device Set
.adx	Data	Approach Index File
.adz	Disk Image	Compressed Amiga Disk File
.aea	Settings	Ae Timer Alarm Document
.aea	Backup	AdWords Editor Archive
.aec	Video	Cinema 4D After Effects Composition
.aep	Encoded	Advanced Encryption Package Encrypted File
.aep	Video	After Effects Project
.aep	eBook	Activ E-Book Project
.aepkey	Misc	Advanced Encryption Package Key File
.aepx	Video	After Effects XML Project
.aes	Encoded	AES Crypt Encrypted File
.aet	Video	After Effects Project Template
.aetx	Video	After Effects XML Project Template
.aex	Web	Alpha Five Compiled Global Functions File
.af2	Vector Image	Micrografx ABC FlowCharter 2 File
.af3	Vector Image	Micrografx ABC FlowCharter 3/4 File
.afc	Audio	Mass Effect 2 Audio File
.afd	CAD	Alphacam Flame Drawing
.afd	Disk Image	AFF Disk Image Part File
.afe	Data	Avid File Exchange File
.aff	Disk Image	AFF Disk Image
.afm	Disk Image	AFF Metadata File
.afm	Font	Adobe Font Metrics File
.afp	Page Layout	Advanced Function Presentation File
.afp	Encoded	FileProtector Encrypted File
.afploc	Misc	Apple Filing Protocol Location
.afs	CAD	STAAD.foundation Project File
.aft	Data	Ancestry.com Family Tree Database
.afx	Raster Image	Auto FX Photo/Graphic Edges Image
.agb	Game	Game Boy Advance ROM
.agd	Data	AgileGraph Data File
.agd	Misc	Agile Advantage E-mail Attachment
.age3scn	Game	Age of Empires 3 Scenario File
.aggr	Data	Adobe Captivate Aggregate File
.agi	Developer	Asterisk Gateway Interface File
.agif	Raster Image	Active GIF Creator Project
.agm	Audio	DTS Multi-channel Pro Packer File
.agp	Raster Image	ArtGem Project File
.agr	Audio	Ableton Groove File
.ahd	Misc	Dynamics AX Online Help Data File
.ahi	Misc	Dynamics AX Online Help Index File
.ahk	Executable	AutoHotkey Script
.ahl	Settings	eMule Metadata File
.ahs	Settings	Adobe Halftone Screen File
.ahu	Settings	Adobe Photoshop HSL File
.ahx	Audio	WinAHX Tracker Module
.ai	Game	Battlefield 2 Artificial Intelligence File
.ai	Vector Image	Adobe Illustrator File
.aia	Settings	Adobe Illustrator Action File
.aic	Raster Image	Advanced Image Coding File
.aif	Misc	Symbian Application Information File
.aif	Audio	Audio Interchange File Format
.aifb	Data	AIF Builder Project File
.aifc	Audio	Compressed Audio Interchange File
.aiff	Audio	Audio Interchange File Format
.aim	Misc	AOL Instant Messenger Launch File
.aim	Text	AIMMS ASCII Model File
.aimppl	Audio	AIMP Playlist File
.ain	Compressed	AIN Compressed File Archive
.ain	Game	Source Engine Compiled AI Nodegraph File
.aip	Plugin	Illustrator Plug-in
.air	Game	M.U.G.E.N. Animation File
.air	Executable	Adobe AIR Installation Package
.ais	Audio	Velvet Studio Instrument
.ais	Raster Image	ACDSee Image Sequence File
.ait	Settings	Adobe Illustrator Template
.aiu	Settings	Advanced Installer Updates Configuration File
.aiv	Data	AIVault Data File
.ajp	Video	CCTV Video File
.akp	Audio	Akai Sampler File
.al	Audio	A-Law Compressed Sound Format
.alac	Audio	ALAC Encoded Audio File
.alaw	Audio	A-Law Compressed Sound Format
.alb	Developer	Alpha Five Library
.albm	Raster Image	HP Photo Printing Software Album File
.alc	Data	Dynamics AX Label Description File
.alc	Audio	Ableton Live Clip File
.ald	Data	Dynamics AX Application Label Data File
.ale	Video	Avid Log Exchange File
.alf	Database	ACT! Lookup File
.ali	Data	Dynamics AX Label Index File
.ali	Data	RoboHelp Alias File
.all	Audio	Cubasis Project File
.all	Settings	Java RMI Policy File
.alm	Developer	Alpha Five Library
.alp	Plugin	Ableton Live Pack File
.alp	Developer	AnyLogic Project File
.alr	Game	ADRIFT Language Resource File
.als	Audio	Ableton Live Set File
.alt	Misc	Dynamics AX Temporary File
.alv	Settings	Adobe Photoshop Levels File
.alx	Developer	Alpha Five Library Index File
.alx	Web	ActiveX Layout Control File
.alx	Settings	BlackBerry Application Loader XML File
.alz	Compressed	ALZip Archive
.am	Video	Anark Media File
.am	Developer	Automake Makefile Template
.am1	Game	Adventure Maker
.am4	Developer	AutoPlay Media Studio 4 Project File
.am5	Developer	AutoPlay Media Studio 5 Project File
.am6	Developer	AutoPlay Media Studio 6 Project
.am7	Developer	AutoPlay Media Studio 7 Project
.amb	Data	All My Books Database File
.amb	Data	AIMMS Model File
.amc	Data	Ant Movie Catalog File
.amc	Video	AMC Video File
.amf	Audio	Advanced Module File
.amfm	Font	Adobe Multiple Font Metrics File
.aml	System	ACPI Machine Language File
.aml	Developer	Abstract Markup Language
.aml	Misc	Microsoft Assistance Markup Language File
.aml	Developer	Arc Macro Language File
.amm	Data	All My Movies Database File
.amp	Settings	Adobe Photoshop Curves Map File
.amr	Audio	Adaptive Multi-Rate Codec File
.ams	Audio	Velvet Studio Module
.ams	Audio	Extreme Tracker Module
.ams	Settings	Adobe Monitor Setup file
.amsorm	Data	OnLine Ringman Auction Client File
.amu	Data	PictureGear Studio Photo Album File
.amv	Video	Anime Music Video File
.amx	Video	Adobe Motion Exchange File
.amx	Plugin	AMX Mod Plugin File
.amxd	Audio	Ableton Max Patch File
.amxx	Plugin	AMX Mod X Plugin File
.amz	Audio	Amazon MP3 Downloader File
.an	Web	Adobe Edge Animate Project File
.an1	Data	Street Atlas USA Draw File
.an2	Game	Croc Legend of the Gobbos Animation File
.an8	3D Image	Anim8or File
.ane	Developer	Adobe AIR Native Extension
.ani	System	Windows Animated Cursor
.anim	3D Image	Unity Animation File
.anim	Video	Amiga Animation File
.anim	3D Image	Antibody Animation File
.anim	3D Image	Maya Animation File
.animset	3D Image	FaceFX Animation Set File
.animset_ingame	3D Image	FaceFX In-Game Animation Set File
.anjuta	Developer	Anjuta IDE Project File
.anm	3D Image	3D Animation File
.anme	Data	Anime Studio Document
.ann	System	Help Annotations
.annot	Misc	Adobe Digital Editions Annotations File
.ans	Text	ANSI Text File
.ans	Data	HotDocs Binary Answer File
.ansym	Data	Adobe Edge Animate Library File
.antispam5	Settings	Personal AntiSpam Settings File
.antmpl	Page Layout	Adobe Edge Animate Template File
.anx	Data	HotDocs Answer File
.any	CAD	AnyRail Layout Plan
.aob	Audio	DVD-Audio Audio Object File
.aod	Misc	Dynamics AX Object Data File
.aof	3D Image	Artlantis Object File
.aoi	Misc	Dynamics AX Application Object Index File
.aoi	3D Image	Art of Illusion 3D Scene
.aois	Settings	CFS Console Add-on Installer Settings File
.aol	Misc	America Online File
.aom	Settings	After Effects Output Module
.aos	System	ARCHOS PCtablet Firmware File
.ap	Web	Active Page
.ap_	Developer	ADT Android Developer Package
.apa	Developer	RSView Development Project Archive
.apalbum	Data	Aperture Album File
.apd	Plugin	Eclipse Plugin Descriptor File
.apd	Raster Image	ACDSee Photo Document
.ape	Audio	Monkey's Audio Lossless Audio File
.ape	Plugin	AVS Plugin Effects File
.apf	Audio	Sony Ericsson Firmware Acoustics File
.apf	Misc	Adobe Profile File
.aph	Data	Ability Album File
.api	Plugin	Acrobat Plug-in
.api	Settings	Adobe Photoshop Inks File
.apk	Executable	Android Package File
.apl	Plugin	ACDSee Plugin File
.apl	Audio	Monkey's Audio Track Information File
.apl	GIS	ArcPad Layer File
.aplg	Plugin	Audials Plug-in
.aplibrary	Data	Aperture Library
.aplp	Plugin	Audials Plug-in Package
.apm	Raster Image	Aldus Placeable Metafile Image
.apng	Raster Image	Animated Portable Network Graphic
.apnx	eBook	Amazon Page Number Index File
.app	Executable	FoxPro Generated Application
.app	Executable	Mac OS X Application
.app	Executable	Symbian OS Application
.appdownload	Misc	Mac App Store Partially Downloaded App
.applescript	Executable	AppleScript File
.applet	Developer	Eclipse Java Applet Policy File
.application	Settings	ClickOnce Deployment Manifest File
.appref-ms	Settings	Microsoft Application Reference File
.appup	Misc	Erlang Application Upgrade File
.appx	Developer	Windows 8 App Package
.appxsym	Developer	Windows 8 App Package Symbols File
.appxupload	Developer	Windows 8 App Upload Package
.apr	GIS	ArcView Project File
.apr	Developer	Apadana Project File
.aps	Developer	Visual C++ Resource File
.aps	Raster Image	Greeting Card Studio Project File
.apt	Text	Almost Plain Text File
.apx	Raster Image	Ability Photopaint Studio Image
.apxl	Data	Keynote Presentation Data File
.apz	Compressed	Autoplay Media Studio Exported Project
.aqm	GIS	AlpineQuest Map File
.aqt	Video	AQTitle Subtitles File
.ar	Compressed	Unix Static Library
.ar	Game	Midtown Madness Data File
.ara	Data	Archivaldo Resource Archive
.arc	Data	Nintendo Archive File
.arc	Backup	Norton Backup Archive
.arc	Compressed	Compressed File Archive
.arc	Game	African Safari Data File
.arc	Backup	Symbian OS Backup File
.arch00	Game	F.E.A.R. Game Archive
.arcut	Video	Prelude Rough Cut File
.ard	CAD	ArtiosCAD Workspace File
.arena	Game	Quake 3 Engine Arena File
.arf	Video	WebEx Advanced Recording File
.arff	Data	Attribute-Relation File Format
.arg	Settings	AutoCAD Profile
.arh	Data	ArheoStratigraf Project File
.arh	Compressed	ProTool Compressed Project File
.ari	Compressed	ARI Compressed File Archive
.ari	Camera Raw	ARRIRAW Image
.aria	Audio	Chipsounds Sound File
.ariax	Audio	Chipsounds XML Sound File
.arj	Compressed	ARJ Compressed File Archive
.ark	Compressed	PowerDesk Pro Archive
.arl	Settings	AOL Organizer File
.aro	Web	SteelArrow Web Application File
.arp	Game	Audition Replay File
.arp	Settings	Advanced RAR Password Recovery Setup
.arpack	Plugin	ArtRage Package
.arr	Misc	Advanced RAR Password Recovery Project
.arr	Raster Image	Amber Graphic File
.arr	Developer	MultiMedia Fusion Array File
.ars	Settings	After Effects Render Settings File
.ars	Game	Carmageddon Saved Game
.arsc	Developer	Android Package Resource File
.arscript	Executable	ArtRage Script
.art	Vector Image	Art Document
.art	Data	BERNINA Embroidery File
.art	Raster Image	AOL Compressed Image File
.art	Developer	Artifacts Artifact File
.art	CAD	ArtCAM Model
.artb	Vector Image	Artboard Document
.artproj	Developer	Artifacts Project
.artwork	Raster Image	ArtStudio Image
.arw	Raster Image	ArtStudio Image
.arw	Camera Raw	Sony Digital Camera Image
.arx	Plugin	AutoCAD Runtime Extension File
.as	Data	AppleSingle File
.as	Developer	ActionScript File
.as2proj	Developer	FlashDevelop ActionScript 2 Project File
.as3proj	Developer	FlashDevelop ActionScript 3 Project File
.as4	Backup	askSam Backup File
.asa	Web	ASP Configuration File
.asat	3D Image	Assemble SAT 3D Model File
.asax	Web	ASP.NET Server Application File
.asb	Executable	Alphacam Stone VB Macro File
.asc	Developer	ActionScript Communication File
.asc	CAD	LTspice Circuit Schematic File
.asc	Text	ASCII Text File
.asc	Text	Autodesk ASCII Export File
.asc	Encoded	PGP ASCII Armored File
.ascii	Text	ASCII Text File
.ascs	Developer	ActionScript Communication Server File
.ascx	Web	ASP.NET User Control File
.asd	Backup	Word AutoSave File
.asd	Audio	Ableton Live Sample Analysis File
.asdb	Developer	Asphyre Sphinx Archive File
.ase	Settings	Adobe Swatch Exchange File
.ase	Text	Autodesk ASCII Scene Export File
.ase	Audio	Velvet Studio Sample
.asec	System	Android Secure Application File
.asef	Settings	Adobe Swatch Exchange File
.asf	Video	Advanced Systems Format File
.ash	Game	Audiosurf Audio Metadata File
.ash	Game	KoLmafia ASH Script
.ash	Misc	Nintendo Wii System Menu File
.ashbak	Backup	Ashampoo Backup Archive
.ashdisc	Disk Image	Ashampoo Burning Studio Image
.ashprj	Data	Ashampoo Burning Studio Project
.ashx	Web	ASP.NET Web Handler File
.asi	Developer	Alpha Five Variable File
.asi	Plugin	Grand Theft Auto Mod Library
.ask	Settings	Ableton Live Skin File
.ask	Database	askSam Database
.asl	Settings	Photoshop Style
.asm	Data	Pro/ENGINEER Assembly File
.asm	Developer	Visual Studio Assembler Source Code File
.asm	Developer	Assembly Language Source Code File
.asm	CAD	Solid Edge Assembly File
.asmx	Web	ASP.NET Web Service File
.asnd	Data	Adobe Sound Document
.asp	Settings	Adobe Color Separation Setup File
.asp	Web	Active Server Page
.aspx	Web	Active Server Page Extended File
.asr	Data	Adobe Photoshop Scratch File
.asr	Web	ActionScript Remote Document
.ass	Misc	Aegisub Advanced Substation Alpha File
.ass	Game	Splinter Cell Blacklist Game Data File
.asset	Game	Unity Asset File
.asstrm	Game	Splinter Cell Blacklist Game Data File
.ast	Spreadsheet	Ability Spreadsheet Template
.ast	Settings	Adobe Color Separations Table
.ast	Data	ClarisWorks Assistant File
.asv	Backup	Finale Auto-save File
.asv	Settings	Adobe Photoshop Selective Color File
.asvf	Developer	Asphyre Sphinx Archive File
.asvx	Backup	Finale Auto-save File
.asw	Raster Image	ACDSee Slideshow Wizard File
.aswcs	Settings	Avast! Compressed Skin File
.asws	Settings	Avast! Skin File
.asx	Video	Microsoft ASF Redirector File
.asx	Developer	Alpha Five Library Temporary Index File
.asy	CAD	LTspice Symbol File
.asy	Vector Image	Asymptote Module
.at3	Audio	ATRAC3 Audio File
.at5	GIS	Lowrance Map File
.atahd	System	ATA Hard Drive Flag File
.atc	Settings	AutoCAD Tool Catalog File
.ate	Backup	Office Accounting Compressed Backup File
.atf	3D Image	Alternativa Texture File
.atf	Settings	Photoshop Transfer Function File
.atf	Data	Axon Text File
.ath	Settings	Alienware AlienFX Theme File
.ati	Backup	Office Accounting Updated Company File
.atl	3D Image	Artlantis 3D Scene File
.atm	Game	PSP Game Audio File
.atm	3D Image	Vue Atmospheres File
.atn	Settings	Photoshop Actions File
.atom	Web	Atom Syndication Format
.atr	Disk Image	Atari Disk Image
.atrac	Audio	Sony ATRAC Audio File
.ats	Data	Advanced ETL Transformation Script
.att	CAD	Alphacam Lathe Tool File
.att	Web	Web Form Post Data File
.attr	Data	iPhoto Attributes File
.atx	GIS	ArcGIS Attribute Index File
.atx	Plugin	Animation Master Plugin File
.aty	Text	Association Type Placeholder
.atz	Settings	Aston Compiled Theme
.atz	Misc	Atomic Time Zone File
.au	Audio	Audio File
.au	Audio	Audacity Audio File
.au3	Developer	AutoIt v3 Script
.aud	Audio	Video Game Compressed Audio File
.aup	Audio	Audacity Project File
.aut	Developer	AutoIt Script File
.automaticdestinations-ms	System	Windows Jump List File
.autoplay	Developer	AutoPlay Media Studio Project File
.aux	GIS	Auxiliary File
.aux	Settings	LaTeX Auxiliary File
.auz	Misc	Ableton Authorization File
.ava	eBook	AvaaBook eBook
.avastlic	Misc	Avast! License File
.avastsounds	Audio	Avast! Soundpack File
.avatar	Raster Image	Google Talk Avatar File
.avb	Video	Avid Bin File
.avc	Video	Avid Media Composer Script
.avc	Data	Kaspersky Virus Database
.avchd	Video	High Definition Video File
.avd	Video	Movie Edit Pro Video Information File
.ave	Settings	Avid User File
.avenirproj	Data	StoryMill Project
.avery	Page Layout	Avery Design & Print Online Label File
.avgdx	Misc	AVG Diagnostics File
.avhd	Disk Image	Hyper-V SnapShot File
.avi	Video	Audio Video Interleave File
.avj	Data	AntiVir Job File
.avl	GIS	ArcView Legend File
.avl	Data	AntiVir Status Report File
.avp	Video	Avid Project File
.avp	Data	AntiVir Profile
.avr	Audio	Audio Visual Research File
.avs	Settings	Adobe Photoshop Variations File
.avs	Video	AviSynth Script File
.avs	Settings	AVS Preset File
.avs	Settings	Avid Project Preferences File
.avs	Video	Application Visualization System File
.avv	Video	Avid Volume Bin File
.avx	Plugin	ArcView Extension File
.avx	Plugin	Avid Plugin File
.aw	Data	Answer Wizard File
.awb	Audio	AMR-WB Audio File
.awc	Misc	Emulex AWC Firmware Update File
.awcav	Settings	ActiveWorlds Custom Avatar File
.awd	Misc	Award BIOS Update File
.awd	Raster Image	Microsoft Fax Document
.awd	Raster Image	Artweaver Document
.awdb	Data	Access Walker Database File
.awg	Vector Image	Ability Draw Document
.awg	Data	Activeworlds Object Group File
.awk	Developer	AWK Script
.awkw	Misc	Awkwords Word Generator File
.awlive	Video	Active Webcam Video File
.awm	Web	AllWebMenus Project File
.awp	Text	Ability Write Template
.aws	Settings	AutoCAD Work Space File
.aws	Spreadsheet	Ability Spreadsheet File
.awt	Text	AbiWord Template
.aww	Text	Ability Write Document
.ax	Plugin	DirectShow Filter
.axd	Web	ASP.NET Web Handler File
.axe	Developer	Annotated XML Example File
.axe	GIS	AutoRoute Map File
.axm	Video	AXMEDIS Object
.axp	Settings	CDBurnerXP Audio Compilation File
.axt	Settings	Adobe Photoshop Extract File
.axt	GIS	Microsoft AutoRoute Template
.axx	Encoded	AxCrypt Encrypted File
.ay	Audio	AY Chiptune File
.az!	Misc	Vuze Partial Download File
.azf	Encoded	AirZip FileSECURE File
.azs	Encoded	AirZip FileSECURE File
.azw	eBook	Amazon Kindle eBook File
.azw1	eBook	Amazon Topaz eBook
.azw2	Executable	Kindle Active Content App File
.azw3	eBook	Amazon KF8 eBook File
.azw4	eBook	Amazon Print Replica eBook
.azz	Data	AZZ Cardfile Database File
.azzx	Data	Uncompressed AZZ Cardfile Data File