| .a | Unix Static Object Code Library Format |
| .a$v | QuarkXpress Automatically Saved Project |
| .a00 | Split Multi-volume ARJ Compressed File Archive (part 2) |
| .a01 | Split Multi-volume ARJ Compressed File Archive (part 3) |
| .a02 | Split Multi-volume ARJ Compressed File Archive (part 4) |
| .a03 | Split Multi-volume ARJ Compressed File Archive (part 5) |
| .a04 | Split Multi-volume ARJ Compressed File Archive (part 6) |
| .a05 | Split Multi-volume ARJ Compressed File Archive (part 7) |
| .a06 | Split Multi-volume ARJ Compressed File Archive (part 8) |
| .a07 | Split Multi-volume ARJ Compressed File Archive (part 9) |
| .a08 | Split Multi-volume ARJ Compressed File Archive (part 10) |
| .a09 | Split Multi-volume ARJ Compressed File Archive (part 11) |
| .a1 | Free Pascal Archive |
| .a10 | Split Multi-volume ARJ Compressed File Archive (part 12) |
| .a11 | Split Multi-volume ARJ Compressed File Archive (part 13) |
| .a12 | Split Multi-volume ARJ Compressed File Archive (part 14) |
| .a13 | Split Multi-volume ARJ Compressed File Archive (part 15) |
| .a14 | Split Multi-volume ARJ Compressed File Archive (part 16) |
| .a15 | Split Multi-volume ARJ Compressed File Archive (part 17) |
| .a16 | Split Multi-volume ARJ Compressed File Archive (part 18) |
| .a17 | Split Multi-volume ARJ Compressed File Archive (part 19) |
| .a18 | Split Multi-volume ARJ Compressed File Archive (part 20) |
| .a19 | Split Multi-volume ARJ Compressed File Archive (part 21) |
| .a1wish | Audials Wishlist Format |
| .a20 | Split Multi-volume ARJ Compressed File Archive (part 22) |
| .a21 | Soundweb Firmware |
| .a26 | Atari 2600 ROM Image Format |
| .a2a | IBM Voice Type Languages Vocabels |
| .a2b | Adlib Tracker II Instrument Bank |
| .a2c | Alice Scene Format |
| .a2desktop | Aston Desktop Desktop Skin |
| .a2i | Adlib Tracker Instrument Format |
| .a2l | ASAP2 Description Format |
| .a2m | AdLib Tracker 2 Format |
| .a2menu | Aston Desktop Start Menu Skin |
| .a2p | Adlib Tracker Pattern Format |
| .a2panel | Aston Desktop Panel Skin |
| .a2r | KittyXplorer Encrypted Archive |
| .a2t | Adlib Tracker Tiny Module Format |
| .a2theme | Aston 2 Theme Format |
| .a2w | Alice Program World Format |
| .a31 | Adobe Authorware Library |
| .a32 | Split Multi-volume ARJ Compressed File Archive (part 34) |
| .a3d | Amapi 3D Modeling |
| .a3g | Photo! 3D Gallery |
| .a3k | Yamaha A3000 Sampler |
| .a3l | Adobe Authorware Library Format |
| .a3m | Adobe Authorware Unpackaged Format |
| .a3p | Alice 3 Project |
| .a3s | Yamaha A3000 Sample |
| .a3w | Adobe Authorware Unpackaged Format |
| .a3x | AccuLoad III.net Settings |
| .a41 | Adobe Authorware Library |
| .a4l | Adobe Authorware Library Format |
| .a4m | Adobe Authorware Unpackaged Format |
| .a4p | Adobe Authorware Package Without Runtime |
| .a4r | Adobe Authorware Package Course |
| .a4w | Adobe Authorware Unpackaged Format |
| .a51 | Adobe Authorware Library |
| .a52 | Atari 5200 Game Image Format |
| .a5d | Adobe Authorware Model |
| .a5l | Adobe Authorware Library Format |
| .a5m | Adobe Authorware Unpackaged |
| .a5p | Adobe Authorware Package Without Runtime |
| .a5r | Adobe Authorware Packaged File Without Runtime |
| .a5rpt | Alpha Five Project Report |
| .a5w | Adobe Authorware Unpackaged Format |
| .a5wcmp | Alpha Five Web Publishing |
| .a64 | Artist 64 |
| .a65 | Adobe Authorware Library Format |
| .a66 | µVision Assembler Source |
| .a6d | Adobe Authorware Model |
| .a6l | Adobe Authorware Library |
| .a6m | Adobe Authorware Unpackaged |
| .a6p | Adobe Authorware Application Format |
| .a6r | Adobe Authorware Packaged File Without Runtime |
| .a6w | Adobe Authorware Unpackaged |
| .a78 | Atari 7800 Image |
| .a7d | Adobe Authorware Model |
| .a7e | Adobe Authorware Packaged Library |
| .a7l | Adobe Authorware Library |
| .a7m | Adobe Authorware Unpackaged |
| .a7p | Adobe Authorware Packaged File Without Runtime |
| .a7r | Adobe Authorware Packaged File Without Runtime |
| .a7w | Adobe Authorware Unpackaged |
| .a86 | A86 Assembly Language Source Code |
| .a8s | Anim8or Script Format |
| .aa | Audible Audio Format |
| .aa3 | Sony ATRAC Audio Format |
| .aaa | Sybase SQLAnywhere Temporary |
| .aab | Adobe Authorware Binary |
| .aac | Advanced Audio Coding Format |
| .aad | FreeBSD |
| .aaf | Advanced Authoring Format Multimedia Format |
| .aam | Adobe Authorware Shocked Format |
| .aao | Agenda At Once Format |
| .aap | Apollo Advanced Playlist |
| .aapkg | ArchestrA IDE Package |
| .aar | Apache Axis2 Archive |
| .aas | Adobe Authorware Shocked Packet |
| .aat | ArcInfo Line Data |
| .aatrend | ActiveFactory Trend |
| .aaui | Adobe Acrobat UI Settings Format |
| .aaw | Lavasoft Ad-Aware 2007 Settings |
| .aawdef | Ad-Aware Definitions Format |
| .aax | Audible Enhanced Audio Format |
| .ab | Google Android Debug Bridge Backup Format |
| .ab$ | Autodesk AutoCAD Plot Spooling |
| .ab1 | DNA Electropherogram Format |
| .ab2 | Print Shop Address Book File |
| .ab3 | Photoimpact 3 Album Format |
| .ab4 | AB4 Accounting & Business Data |
| .ab6 | ABStat Data |
| .ab65 | Adobe PageMaker Document |
| .ab8 | ABStat Data |
| .aba | Palm Address Book Archive Format |
| .abbu | Apple Address Book Archive Format |
| .abc | Musical Notation Language Format |
| .abcd | AudioVisual Book Data Format |
| .abcddb | Apple Address Book Database |
| .abcdg | Apple AddessBook |
| .abcdmr | Apple Address Book Mail Recent |
| .abcdp | Address Book Card Data |
| .abd | The Bat! Mail Processing System |
| .abdata | Adobe Bridge Data Format |
| .abe | Application Boundaries Enforcer |
| .abf | Adobe Binary Screen Font Format |
| .abg | FIFA World Cup Game Data Beart |
| .abi | Chromatogram Editor Format |
| .abicollab | AbiWord Collaborative File Descriptor |
| .abk | Ability Write Backup Format |
| .abkprj | Ashampoo Burning Studio Backup Project Format |
| .abl | ABEL Hardware Description Language |
| .abm | Music Album Format |
| .abn | Alpha Five |
| .abp | AVS Barcode Profile |
| .abr | Adobe Photoshop Brush Format |
| .abs | Absolute Database Single-file Database Format |
| .abt | The Arbiter Game Schedule |
| .abu | ACT! E-mail Address Book |
| .abw | AbiWord Document Format |
| .abx | Corel WordPerfect Mail Address Book |
| .aby | AOL Directory Format |
| .abz | Alpha Black Zero Game |
| .ac | AC3D Geometry Format |
| .ac$ | AutoCAD Undo Info Format |
| .ac0 | SPICE AC/frequence Domain Output |
| .ac1 | SPICE AC/frequence Domain Output |
| .ac2 | SPICE AC/frequency Domain Output |
| .ac3 | Dolby Digital Sound Format |
| .ac3d | 3d Format Data |
| .ac4 | SPICE AC/frequence Domain Output |
| .ac5 | ArtCut 5 Document Format |
| .ac6 | Artcut Software Graphics Design Format |
| .ac7 | SPICE AC/frequence Domain Output |
| .ac8 | SPICE AC/frequence Domain Output |
| .ac9 | SPICE AC/frequence Domain Output |
| .aca | Microsoft Agent Character Format |
| .aca2 | Fontographer |
| .acad | AutoCAD Database |
| .acb | Adobe Color Book Format |
| .acbl | Adobe Color Book Format |
| .acc | DR DOS - ViewMax Format |
| .accda | Microsoft Access 2007/2010 Add-in Format |
| .accdb | Microsoft Access 2007/2010 Database Format |
| .accdc | Microsoft Access 2007/2010 Digitally Signed Database Format |
| .accde | Microsoft Access 2007/2010 Compiled Execute Only Format |
| .accdp | Microsoft Access 2007/2010 Project |
| .accdr | Microsoft Access 2007/2010 Runtime Mode Database Format |
| .accdt | Microsoft Access 2007/2010 Database Template Format |
| .accdu | Microsoft Access 2007/2010 Database Wizard Format |
| .accdw | Microsoft Access Link Format |
| .access | Java Access Control |
| .accessor | Microsoft Visual Studio Accessor |
| .accfl | Microsoft Access Field Template |
| .accft | Microsoft Access Template Format |
| .accountpicture-ms | Microsoft Windows 8 Account Picture Format |
| .acct | IBM AIX System |
| .acd | Sonic Foundry ACID Audio Format |
| .acd-bak | Sony ACID Project Backup Format |
| .acd-zip | Sony ACID Compressed Project Format |
| .ace | WinACE Compressed Ace Archive Format |
| .acf | Microsoft Agent HTTP Character Format |
| .acfm | Adobe Composite Font Metrics Format |
| .acg | Age Of Wonders Saved Game |
| .acgd | ACG System Predictive Model |
| .acgi | ACGI Script (WWW) |
| .acgl | ACG System Licence |
| .ach | Medlin Payroll Software Automated Clearing House |
| .aci | ACI Development Appraisal |
| .ack | Swifty |
| .acl | Microsoft Office Automatic Correction List |
| .aclock | Amazing Clock |
| .acm | ACM Compressed Sound Format |
| .acmd | Apache Commander Project |
| .aco | Adobe Photoshop Color Palette And Swatches Format |
| .acorn | Acorn Draw Format |
| .acp | Alfresco Exported Repository Format |
| .acq | AcqURL Bookmark Manager |
| .acr | Bitmap Graphics |
| .acrobatsecuritysettings | Adobe Acrobat Security Settings Format |
| .acrodata | Adobe Acrobat Data Format |
| .acroplugin | Adobe Acrobat Plug-in Format |
| .acrs | Adobe Authorware |
| .acrypt | AutoCrypt Encrypted Document |
| .acs | Microsoft Agent Character Structured Storage Format |
| .acs2 | AIMP Media Player Skin |
| .acs3 | AIMP Skin Package |
| .acsm | Adobe Content Server Message Format |
| .act | Adobe Photoshop/Illustrator Color Table |
| .act! | ACT! |
| .action | Mac OS X Automator Action Format |
| .actions | Photoline 4 Defaults |
| .actionScriptProperties | Adobe Flex Settings |
| .activitydiagram | Microsoft Visual Studio Activity Diagram |
| .actm | Autodesk AutoCAD Action Macro Format |
| .actproj | Microsoft Visual Studio Visual SourceSafe ACT Project |
| .actx | DS Game Maker Action Description Format |
| .acu | Machine Independent COBOL Object |
| .acv | Adobe Photoshop Colour Curves Format |
| .acw | Microsoft Accessibility Wizard Format |
| .acx | Atari ST Program Format |
| .ad | After Dark Screen Saver Format |
| .ad1 | Forensic Toolkit FTK Imager Image |
| .ad3e | Adobe Dimensions Mac |
| .ad65 | PageMaker 6.5 |
| .ada | ADA Language Source Code Format |
| .adadownload | Adobe Download Assistant Partially Completed Download |
| .adb | Ability Database Database Format |
| .adba | AIMSS Author Project Configuration |
| .adblock | Alpha Five Temporary |
| .adc | Lingvo Dictionary Format |
| .adcp | Adobe Device Centra Project |
| .add | Microsoft Dynamics AX Developer Documentation Format |
| .addin | Microsoft Visual Studio Addin Format |
| .addon | CFS Console Add-on Format |
| .addr | Metin2 Data |
| .ade | Microsoft Access Compiled Project Format |
| .adf | ArcView ARC/INFO Coverage Data Format |
| .adg | Ableton Live Device Group Format |
| .adh | Audible Manager |
| .adi | Active@ Disk Image Format |
| .adiumemoticon | Adium Dock Icon |
| .adiumemoticonset | Adium Emoticon Set |
| .adiumhtmllog | Adium HTML Log |
| .adiumicon | Adium Icon |
| .adiumlibpurpleplugin | Adium Lib Purple Plugin |
| .adiumlistlayout | Adium List Layout |
| .adiumlisttheme | Adium List Theme |
| .adiumlog | Adium Log |
| .adiummenubaricons | Adium Menu Bar Icon |
| .adiummessagestyle | Adium Message Style |
| .adiumplugin | Adium Plugin |
| .adiumscripts | Adium AppleScripts |
| .adiumserviceicons | Adium Service Icons |
| .adiumsoundset | Adium Sound Set |
| .adiumstatusicons | Adium Status Icon |
| .adj | LISCAD Adjustment |
| .AdjustmentPresets | Apple Aperture Preset |
| .adk | OS/2 Saved SKF Format |
| .adl | ADONIS Models And Model Groups Export |
| .adls | ADL Workbench |
| .adm | Administrator Policy Template Format |
| .adml | Microsoft Administrative Language-specific XML Template Format |
| .admx | Microsoft Administrative XML Template Format |
| .adn | Microsoft Access Blank Project Template |
| .ado | Adobe Photoshop Duotone Format |
| .adobebridge | Adobe Bridge |
| .adobenet | Adobe Production Studio |
| .adoc | Authentica Secure Office Encoded Word Document |
| .ados | Compound Document |
| .adox | ActivDox Document Format |
| .adp | Microsoft Access Project Format |
| .adpp | Adobe Device Central Package Profile |
| .adr | Opera Bookmarks Format |
| .adrg | ARC Digitized Raster Graphics |
| .ads | Ada Package Specification |
| .adsk | Autodesk Exchange |
| .adsm | Advanced Split Machine Split |
| .adt | Lingvo Dictionary Format |
| .adtg | Advanced Data TableGram |
| .adts | Audio Data Transport Stream |
| .adu | Dictionary Format |
| .adv | Nortek Acoustic Doppler Velocimeter Format |
| .advs | Adobe Device Central Format |
| .adw | Tamil Transliterater/font Converter |
| .adx | Approach Database Index Format |
| .adz | Amiga Emulator Compressed ADF Format |
| .ad_asm | Alibre Design CAD |
| .ad_prt | Alibre Design CAD |
| .ae0 | NetBSD Ethernet Configuration |
| .ae1 | FileMaker Pro Runtime Database |
| .aea | Ae Timer Alarm Document Format |
| .aeb | Alphacam Wire EDM VB Macro |
| .aec | DataCAD Drawing Format |
| .aed | Alphacam Wire EDM Drawing |
| .aee | ASUS Data Security Manager Encoded |
| .aef | ELECTRICAL Designer Related |
| .aeh | IPer Advanced Embedded Hypertext |
| .aem | Alphacam Wire EDM Parameter Macro |
| .aep | Adobe After Effects Project Format |
| .aepkey | Advanced Encryption Package Key Format |
| .aepx | Adobe After Effects XML Project Format |
| .aer | Adobe Atmosphere |
| .aes | AES Crypt Encrypted Format |
| .aet | Adobe After Effects Template Format |
| .aetx | Adobe After Effects Format |
| .aeu | Microsoft AutoRoute Express Europe Route |
| .aex | Greetings Card Format |
| .aexpk | PGP Armored Extracted Public Key |
| .af | 3DPlus Model |
| .af2 | Micrografx FlowCharter 2.0 Flowchart Format |
| .af3 | Micrografx FlowCharter Flowchart Format |
| .afa | Astrotite Compressed Data |
| .afb | Alphacam Flame VB Macro |
| .afc | Compressed Audio Interchange Format Format |
| .afd | Alphacam Flame Drawing Format |
| .afe | Avid Media Metadata Format |
| .aff | Advanced Forensics Format Disk Image |
| .afg | Tablet Assembly |
| .afl | XMap Related |
| .afm | Adobe Font Metrics Format |
| .afn | ArtCAM Font |
| .afo | Advanced File Organizer Catalog |
| .afo-xvid | Compressed Video |
| .afp | FileProtector Encrypted Format |
| .afploc | Apple Mac OS X Filing Protocol Location Format |
| .afpp | Mac Apple Share |
| .afr | FreeBSD |
| .afs | STAAD.foundation Project Format |
| .afs3 | AFS 3 Basic Encrypted |
| .aft | Family Tree Data Format |
| .afw | Micrografx FlowCharter Work Area |
| .afx | Auto F/X Image Format |
| .afz | Family Tree Backup |
| .ag | Applix Graphics |
| .ag4 | Microsoft Access G4 |
| .aga | ArcGIS ArcGlobe |
| .agb | Nintendo Game Boy Advance ROM Image |
| .agc | Compiled Script |
| .agd | Agile Advantage Format |
| .agd1 | Adobe FreeHand For Mac Drawing |
| .agd2 | Adobe FreeHand 7 For Mac |
| .agdb | ANSYS DesignSpace |
| .age3rec | Age Of Empires III Recorded Game |
| .age3sav | Age Of Empires III Save Game |
| .age3scn | Age Of Empires III Scenario Format |
| .age3Xrec | Age Of Empires III: The WarChiefs Recorded |
| .age3xsav | Age Of Empires III: The WarChiefs Save Game |
| .age3Xscn | Age Of Empires III: The WarChiefs Scenario |
| .age3yrec | Age Of Empires III: The Asian Dynasties Recorded Game |
| .age3ysav | Age Of Empires III: The Asian Dynasties Save Game |
| .age3Yscn | Age Of Empires III: The Asian Dynasties Scenario |
| .agent | Forte Agent And FreeAgent Data |
| .ageo | Dream Aquarium Fish Model |
| .agf | Atlas GIS Native Binary Geodataset |
| .agg | AggFlow Plant Flow Analysis |
| .aggr | Adobe Captivate Aggregator Format |
| .agi | Asterisk Gateway Interface Format |
| .agif | Active GIF Creator Project Format |
| .agilekeychain | 1Password Data |
| .agl | ArgusLab Molecular Graphics Modelling |
| .agldei | Adobe GoLive Template |
| .agls | Adobe GoLive Snippet |
| .aglsl | Adobe GoLive Site |
| .agm | Audio Format |
| .agmodule | Adobe Lightroom Module |
| .ago | Autolog Script |
| .agp | ArtGem Project Format |
| .agprefs | Adobe Photoshop Lightroom Preferences |
| .agr | Ableton Live Groove Format |
| .ags | AfterGRASP Script |
| .agtemplate | Adobe Photoshop Lightroom Preset |
| .agtoolkit | Adobe Photoshop Lightroom |
| .agv | ArcGlobe Video Metadata |
| .agw | Aspen Graphics |
| .agwl | Abstract Grid Workflow Language |
| .agx | Rational XDE |
| .agx1 | Adobe FreeHand For Mac Extension |
| .agz | AggFlow Aggregate Plant Flow Diagram |
| .ah | FreeBSD |
| .ahb | AIM High Briefcase Report |
| .ahc | Resident Evil 4 |
| .ahd | Microsoft Dynamics AX On-line Help Data Format |
| .ahf | Aces High Film |
| .ahi | Microsoft Dynamics AX Online Help Index Format |
| .ahk | AutoHotkey Script Format |
| .ahl | EMule Metadata Format |
| .ahod | Homeworld |
| .ahp | AutoCAD Help |
| .ahs | Adobe Photoshop Halftone Screens Format |
| .ahtm | HTML |
| .ahtml | HTML |
| .ahu | Adobe Photoshop Hue Saturation Lightness Format |
| .ahx | WinAHX Tracker Module Format |
| .ai | Adobe Illustrator Graphics Format |
| .ai3 | Generic Encapsulated PostScript Graphic Format |
| .ai4 | Generic Encapsulated PostScript Graphic |
| .ai5 | Generic Encapsulated PostScript Graphic |
| .ai6 | Generic Encapsulated PostScript Graphic |
| .ai65 | Adobe PageMaker For Mac Extension |
| .ai7 | Generic Encapsulated PostScript Graphic |
| .ai8 | Generic Encapsulated PostScript Graphic Format |
| .aia | Adobe Illustrator Action Format |
| .aic | Advanced Image Coding Format |
| .aid | Star Trek Armada Arficicial Intelligence Parameters |
| .aidl | AIDL Interface |
| .aif | Audio Interchange File Format Sound Format |
| .aifb | AIF Builder Project Format |
| .aifc | Audio Interchange File Format Sound File With Compression |
| .aiff | Audio Interchange File Format |
| .aifr | Audio Interchange File Format |
| .aig | Architecture Drawing |
| .aih | Attribute Index |
| .aij | Oracle After-Image Journal |
| .ail | AutoImager |
| .aim | AIMMS ASCII Model Format |
| .aimppl | AIMP Media Player Playlist Format |
| .ain | ArcView Attribute Index Format |
| .aio | Bitmap |
| .aip | Adobe Illustrator Plugin Format |
| .air | Adobe AIR Rich Internet Applications |
| .airapplication | Adobe AIR Application |
| .airi | Adobe AIR Intermediate |
| .airport | RealFlight Simulator |
| .airports | RealFlight Airports Data |
| .ais | ACDSee Album Image Sequence Format |
| .ait | Adobe Illustrator Template Format |
| .aiu | Advanced Installer Updates Configuration Format |
| .aiv | AIVault Data Format |
| .aiw | Formula One 2001 Game |
| .aix | IBM AIX |
| .aja | Backup Revision Control Archive |
| .ajb | Alphacam Water Jet VB Macro |
| .ajd | Alphacam Water Jet Drawing |
| .ajg | AJC Grep Project |
| .ajl | CA ARCserve Backup Journal |
| .ajm | Alphacam Water Jet Parameter Macro |
| .ajp | AJP Player Video Format |
| .akai | Akai S-series Floppy Disk Image |
| .akf | Adobe Acrobat Key |
| .akm | Aksharamala Keymap Binary |
| .akp | Akai S5000, S6000 Program Format |
| .aks | Aksharamala Keymap Binary |
| .akt | Aksharamala Keymap Source |
| .akw | Adobe RoboHelp Help Project Index Designer |
| .al | A-Law Compressed Sound Format |
| .al3 | Electronic Data Interchange |
| .al8 | AAA Logo Project |
| .ala | Alan Interactive Fiction Language |
| .alac | Apple Lossless Audio Codec Audio Format |
| .alarmz | Alarmz Alarm |
| .alaw | A-Law Compressed Sound Format |
| .alb | Alpha Five Data Dictionary |
| .alb3 | Adobe PageMaker Document |
| .alb4 | Adobe PageMaker For Mac Document |
| .alb5 | Adobe PageMaker 5 Document |
| .alb6 | Adobe PageMaker For Mac |
| .albm | Photo Album Format |
| .album | Thumbnail Cache |
| .alc | Visual MP3 Embedded Dynamic Lyrics |
| .alc4 | Adobe PageMaker For Mac Dictionary |
| .alco | URL Manager Pro |
| .ald | Microsoft Dynamics AX Application Label Data Format |
| .ald2 | Adobe PageMaker For Mac |
| .ald3 | Adobe PageMaker 3 For Mac |
| .ald4 | Adobe Pagemaker 4 For Mac |
| .ald5 | Adobe PageMaker 6 For Mac |
| .ald6 | Adobe PageMaker 6 For Mac |
| .aldf | Aldefaer Data |
| .ale | Avid Log File Format |
| .alf | ACT! Lookup Format |
| .alf6 | PageMaker Default |
| .alg | ER Mapper Algorithm |
| .alh5 | Adobe PageMaker Add-in |
| .ali | BlackBerry Application Loader Format |
| .alias | Alias Image |
| .aliases | LabVIEW IP Adresses Map |
| .all | Cubasis Project Format |
| .allow | Linux Access |
| .alm | Alpha Five Database Information |
| .almb | Mac OS 8.1 Action Module Data |
| .almn | Location Manager Module |
| .aln | LexNavigator Database Update |
| .alo | Star Wars: Empire At War Game |
| .alp | Ableton Live Pack Format |
| .alr | ADRIFT Language Resource Format |
| .als | Ableton Live Project Format |
| .alt | Microsoft Dynamics AX Temporary Format |
| .alt3 | Adobe PageMaker Template |
| .alt4 | Adobe PageMaker For Mac |
| .alt5 | Adobe Pagemaker 5 For Mac Document |
| .alt6 | Adobe PageMaker 6 |
| .alth | QuickHelp For Mac |
| .altp | QuickHelp |
| .altq | QuickView Settings |
| .altv | QuickView Help |
| .alv | Adobe Photoshop Levels Format |
| .alw | A-law G.711 European Telephony Format |
| .alx | BlackBerry Application Loader Format |
| .aly | Sage ACT! |
| .alz | ALZip Compressed Format |
| .am | GLPK Automake/autoconf Makefile Definitions Format |
| .am1 | Adventure Maker Project Format |
| .am2 | AutoPlay Menu Studio Ver.2 Data |
| .am3 | AutoPlay Menu Studio Ver.3 Data |
| .am4 | AutoPlay Menu Studio Version 4 Project Format |
| .am5 | AutoPlay Menu Studio Ver.5 Data Format |
| .am6 | AutoPlay Menu Studio Ver.6 Data Format |
| .am7 | AutoPlay Menu Studio Ver.7 Data Format |
| .ama | ArcGIS ArcMap |
| .amaya | Amaya |
| .amb | Alphacam 3D Mill Or 2D Mill VB Macro Format |
| .amc | Ant Movie Catalog Format |
| .amd | Alphacam 3D Mill, 2D Mill Drawing |
| .ame | ACT! E-mail System Library |
| .amf | DSMIA/Asylum Module Music Format |
| .amfm | Adobe Multiple Font Metrics Format |
| .ami | Amica Paint |
| .amipro | Ami Pro Table Structure |
| .amj | AceMoney |
| .amk | AceMoney Backup |
| .aml | Microsoft Assistance Markup Language |
| .amm | Abbyy Format |
| .amo | AIM AOL Instant Messenger UI Extension |
| .amodel | ActiveModeler Project |
| .amos | AMOS Basic Code |
| .amp | Adobe Photoshop Arbitrary Map Settings Format |
| .amr | Adaptive Multi-Rate Compressed Audio Format |
| .ams | Velvet Studio Module Format |
| .amsm | Atomic Mail Sender Project |
| .amsorm | OnLine Ringman Format |
| .amst | Atomic Mail Sender Template |
| .amt | ABBYY Finereader 5.0 Pro |
| .amt50 | BERNINA V5.0 Embroidery Software Template |
| .amt60 | BERNINA V6.0 Embroidery Software Template |
| .amu | Sony PictureGear Studio Photo Album Format |
| .amv | AMV Video File Format |
| .amw | Alcorn McBride Show Controller |
| .amx | Adobe Motion Exchange Format |
| .amxd | Max For Live Project Format |
| .amxx | AMX Mod X Plug-in Format |
| .amz | Amazon MP3 Downloader Format |
| .an | Adobe Edge Animate Project Format |
| .an1 | DeLorme Street Atlas Drawing Format |
| .an2 | Croc Animation Format |
| .an8 | Anim8or 3D Animation Format |
| .ana | Analysis For Windows |
| .anat | XNBC Network Anatomy |
| .anc | Alphacam NC Program |
| .android | Readme |
| .ane | Adobe AIR Native Extension Format |
| .anf | ANSYS DesignModeler |
| .ang | AIMSUN NG Related |
| .anh | ActivTrak Net View History |
| .ani | Animated Cursor |
| .anim | Amiga Animation Format |
| .animset | FaceFX Animation Set Format |
| .animset_ingame | FaceFX In-Game Animation Set Format |
| .aniso | Chemical Crystallography |
| .anjuta | Anjuta DevStudio Project Format |
| .anki | Anki Deck |
| .anl | Project Analyzer Saved Analysis |
| .anm | 3D Animation Format |
| .anme | Anime Studio Project Format |
| .ann | Microsoft Windows Help Annotation Format |
| .annot | Adobe Digital Editions Annotations Format |
| .anr | DeLorme Street Atlas Route |
| .ans | ANSI Text File (ANSI Art) |
| .ansr | AnswerTool Answer Document |
| .ansym | Adobe Edge Animate Library Format |
| .ant | CalcAnt Saved Calculation |
| .antifrag | DC++ Incomplete Download |
| .antispam5 | Personal AntiSpam Settings Format |
| .antmpl | Adobe Edge Animate Template |
| .anv | AirNav Image |
| .anx | HotDocs Answer Format |
| .any | AnyRail Layout Plan Format |
| .anydvdhd | AnyDVD Registration Key |
| .ao | ActionOutline Data |
| .aob | DVD Audio Object Format |
| .aod | Microsoft Dynamics AX Object Data Format |
| .aof | Artlantis Object Format |
| .aoi | AOI Scene Format |
| .aois | CFS Console Add-on Installer Settings Format |
| .aol | America On-line Related Format |
| .aom | Adobe After Effects Output Settings Format |
| .aop | JBoss AS JAR Archive |
| .aos | Archos Signed Encrypted Data Format |
| .aot | ZenWorks SnAppShot Application Binary Object Template |
| .ap | Fifth Generation Systems Active Page Format |
| .ap0 | Microsoft Windows APW_data |
| .ap2 | ActivInspire Resource Pack |
| .ap3 | Asprova Project |
| .ap? | LoseThos C+ Source |
| .apa | RSView Application Manager Archive |
| .apalbum | Apple Aperture Album Format |
| .apb | Alphacam Punch VB Macro |
| .apc | AiroPeek Wireless Trace Capture |
| .apcdoc | Ashampoo Photo Commander |
| .apd | ACDSee Photo Document |
| .apdb | Apple Aperture Library |
| .apdetected | Apple IPhoto |
| .apdisk | Apple Mac OS X Related |
| .ape | Winamp Plug-ins AVS Format |
| .ApertureEdit | Apple Aperture |
| .ApertureExport | Apple Aperture |
| .apex | AVM Sample Studio Bank |
| .apf | Adobe Acrobat Profile Format |
| .apfacename | Apple IPhoto Face Data |
| .apg | APGen Script |
| .aph | Ability Photoalbum Album Database Format |
| .api | Adobe Acrobat Plugin Format |
| .apin | Adobe InDesign Import/export Filter |
| .api_filters | Eclipse API Settings |
| .apj | AutoCAD Project |
| .apk | Google Android Package Format |
| .apl | ArcPad Layer Format |
| .aplg | Audials One Add-on Format |
| .aplibrary | Aperture Pictures Library Database Format |
| .aplmodel | Apple ICal |
| .apln | Adobe InDesign 3rd Party Extension |
| .aplp | Audials One Add-on Installation Package Format |
| .aplt | Mac OS X AppleScript Applet |
| .apm | Aldus Placeable Metafile |
| .apng | Animated Portable Network Graphics Format |
| .apnx | Amazon Kindle Index Format |
| .apo | Abacre Paperless Office |
| .app | MAC Application Package Or Core System Service Format |
| .app-se | Sony Ericsson XPERIA X10 |
| .appcache | HTML5 Cache Manifest |
| .appdata | VMWare Cache |
| .appdownload | Mac OS X App Store Incomplete Download Format |
| .appicon | VMWare Cache |
| .apple | Apple AppleSingle Data |
| .appledouble | Apple AppleDouble Resource |
| .applescript | AppleScript Script Format |
| .AppleSyncInfo | IOS |
| .applet | Eclipse IDE For Java Developers Format |
| .appletviewer | Java Appletviewer |
| .apple_partition_map | Apple Partition Scheme |
| .application | ClickOnce Deployment Manifest Format |
| .appref-ms | Application Reference Format |
| .appup | Erlang Application Upgrade Format |
| .appv | App-V Archive |
| .appx | Microsoft AppX Application Package Format |
| .appxmanifest | Windows Store App Source Manifest |
| .appxsym | Microsoft Visual Studio Windows 8 Application Information Format |
| .appxupload | Microsoft Visual Studio Windows 8 Application Upload Format |
| .apr | ArcView Project Format |
| .apref-ms | Application Reference |
| .aprj | ApacheConf Project |
| .aps | Microsoft Visual C++ Binary Version Of Resource Format |
| .apsmartalbum | Apple Aperture |
| .apt | Almost Plain Text Format |
| .apu | Audacity Audio |
| .apv | Acerose Password |
| .apvault | Apple Aperture Vault |
| .apw | Password |
| .apx | Borland C++ Appexpert Database Format |
| .apxl | Apple Keynote Presentation XML Document Settings Format |
| .apxt | DataLink Setting |
| .apz | AMS Shared Project Format |
| .ap_ | Google Android Development Resources Package Format |
| .aq | Ancestral Quest Genealogy |
| .aq1 | AptiQuiz Test |
| .aqa | AptiQuiz Result |
| .aqc | AquaChem Database |
| .aqf | Aquifer-Generated Web Page |
| .aql | AOL DLL |
| .aqm | AlpineQuest GPS Hiking Map Format |
| .aqp | Quizmaker 08 And Older Quiz |
| .aqq | AQQ Extension |
| .aqt | AQTitle Subtitles Format |
| .aqz | Amateur Radio Questionary Data |
| .ar | Linux/Unix Command Library Format |
| .ar-wmp | BrainVoyager QX Anatomical-resolution Volume Map |
| .ara | Archivaldo Resource Archive |
| .arb | Alphacam Router VB Macro |
| .arbvp1 | Google Earth Shader |
| .arc | ARC Lossless Data Compression And Archive Format |
| .arch00 | F.E.A.R. Game Archive Format |
| .arch01 | F.E.A.R. 2 Game |
| .archcfg | F.E.A.R. 2 Project Origin Configuration |
| .architect | Soundweb London Design |
| .archiver | Incredible Bee Archiver Archive |
| .arcinfo | ArcInfo Info |
| .arcut | Adobe Prelude Rough Cut Format |
| .ard | ArtiosCAD Workspace Format |
| .are | BioWare Aurora Engine Area |
| .arena | Quake 3 Id Tech 3 Game Engine Arena Settings Format |
| .arf | WebEx Advanced Recording Format |
| .arff | Weka Attribute-relation Format |
| .arg | AutoCAD Profile Export Format |
| .argo | ArgoUML Project |
| .arh | El Airplane Game Archive Format |
| .ari | ARRI Raw Image Format |
| .aria | Chipsounds Audio Format |
| .ariax | Chipsounds XML Sound Format |
| .arj | ARJ Compressed Archive Format |
| .ark | ARC File Archiver CPM/Port Archive Format |
| .arl | AOL Organizer Format |
| .arlc | Commandos 2 Men Of Courage Game |
| .arm | MySQL Archive Storage Engine Metadata |
| .ArmA2OAProfile | ArmA 2 Settings |
| .ArmA2Profile | ARMA2 Profile |
| .armx | ASP.NET Source |
| .army | Impossible Creatures Collection Of Created Creatures |
| .arn | Astronomical Research Network Image Format |
| .aro | SteelArrow Script Format |
| .arp | Alphacam Router Post Format |
| .arpack | ArtRage Package |
| .arpi | Adobe Extension |
| .arq | BSM Action Request System Client Macro |
| .arr | Advanced RAR Password Recovery Project Format |
| .ars | Adobe After Effects Render Settings Format |
| .arsc | Google Android Resource Format |
| .arscript | ArtRage Script |
| .art | Bernina Artista Embroidery Format |
| .art42 | V1.x Explorations Projects |
| .art50 | BERNINA V5.0 Embroidery Software Designs |
| .art6 | Articulate Presenter Compressed |
| .ART60 | BERNINA V6.0 Embroidery Software Designs |
| .artb | Artboard Vector Drawing Format |
| .artf | Adobe FreeHand Xtra |
| .artproj | Artifacts Project Format |
| .artwork | ArtStudio Image Format |
| .artx | Artisteer Project |
| .artz | Adobe Illustrator For Mac |
| .aru | Autorun.aru Malicious |
| .arv | Microsoft Autoroute User Information |
| .arw | Sony Digital Camera RAW Image Format |
| .arx | AutoCAD Runtime Extension Format |
| .arxml | AUTOSAR XML |
| .ary | SmartStart Scripting Toolkit |
| .arz | MySQL Archive Storage Engine Data |
| .as | Adobe Flash ActionScript Document |
| .as$ | Microsoft Word Temporary |
| .as2 | ACTIVstudio Resource |
| .as2proj | FlashDevelop Project Format |
| .as3a | ActivInspire Resource |
| .as3proj | FlashDevelop ActionScript 3 Project Format |
| .as4 | AskSam Backup Format |
| .as4a | ActivInspire Resource Pack |
| .as? | LoseThos Assembly Source |
| .asa | Active Server Configuration Format |
| .asat | Assemble SAT 3D Model Format |
| .asax | ASP.NET Application Optional Source Format |
| .asb | Alphacam Stone VB Macro Format |
| .asbx | Microsoft ASP.Net BridgeHandler |
| .asc | ASCII Text Characters Format |
| .ascii | ASCII Text Characters Format |
| .ascm | Adobe Content Server Message |
| .ascs | Adobe Device Central Format |
| .ascx | Active Server Pages Web User Control Format |
| .asd | Microsoft Word Auto-save Document Format |
| .asdb | Asphyre Sphinx Archive |
| .asdvdcrtproj | Aimersoft DVD Creator Project |
| .ase | Adobe Swatch Exchange Format |
| .asec | Google Android Encrypted Application Package Format |
| .asef | Adobe Swatch Exchange |
| .asep | Separator For Mac |
| .asf | Advanced Systems (streaming) Format |
| .asg | Airport Tycoon Saved Game |
| .asgp | HP-UX NIS Maps Configuration |
| .ash | Audiosurf Audio Metadata Format |
| .ashbak | Ashampoo Burning Studio Backup Archive Format |
| .ashdisc | Ashampoo Disk Image Format |
| .ashlang | Ashampoo Media Player+ |
| .ashprj | Ashampoo Burning Studio Project Format |
| .ashx | ASP.NET Web Handler Format |
| .asi | Alpha Five Storage Format |
| .asic | ASIC Source |
| .asis | Apache As Is |
| .ask | AskSam Database Format |
| .asl | Adobe Photoshop Layer Style Format |
| .asm | Assembler Source Code Format |
| .asmdot | SolidWorks Assembly Template |
| .asmprp | SolidWorks Assembly Custom Properties Tab Template |
| .asmx | Active Server Plus Web Services Source Format |
| .asn | GameSpy Arcade Skin |
| .asnd | Adobe Soundbooth Sound Document Format |
| .aso | Sage Accpac Simply ASO Import |
| .asp | Active Server Page Script Page |
| .asp+ | ASP.NET ASP+ |
| .aspr | ASProtect Related |
| .asproj | Microsoft Visual Studio Analysis Services Project |
| .aspx | Active Server Page Extended ASP.NET Script Format |
| .asr | Adobe Photoshop Scratch Area Format |
| .asrp | Arc Standard Raster Product |
| .ass | Advanced SubStation Alpha Subtitle Format |
| .asset | Unity Asset Format |
| .assistant | HP Printer Utility For Mac Assistant Plugin |
| .assoc | Associate This Association Database |
| .asstrm | Splinter Cell Blacklist Game Data |
| .ast | Adobe Photoshop Colour Separation Table |
| .ast2 | Astrotite |
| .astx | Adobe Story Exported Script |
| .asu | ToolBook Package Definition |
| .asv | Adobe Photoshop Selective Colour Format |
| .asvf | Asphyre Sphinx Archive |
| .asw | ACDSee Slideshow Wizard Format |
| .aswcs | Avast! Antivirus Skin |
| .asws | Avast! Antivirus Skin |
| .asx | Microsoft Advanced Streaming Redirector Format |
| .asxml | XML Music Playlist |
| .asy | LTspice IV Circuit Diagram Format |
| .asz | LoseThos Assembly Source |
| .as_ | Winhelp Compressed |
| .at3 | Airport Tycoon 3 Saved Game |
| .at5 | Lowrance Chart Format |
| .at65 | Adobe PageMaker For Mac |
| .ata | Antenna Project |
| .atahd | Puppy Linux ATA Hard Drive Flag Format |
| .atak | Soundscape Audio-Take |
| .atb | AnetHelp Tools |
| .atc | AutoCAD Catalog Format |
| .atd | Microsoft Systems Management Server |
| .ate | Microsoft Office Accounting Compressed Backup Format |
| .atf | Adobe Photoshop Transfer Function Format |
| .ath | Alphacam Lathe Thread Format |
| .atheme | Amazing Clock Theme |
| .ati | Microsoft Office Accounting Updated Company Format |
| .atk | Andrew Toolkit Raster Object |
| .atl | Artlantis 3D Scene Format |
| .atlas | Stronghold 3 Editor |
| .atlg | SlimBrowser Auto Login |
| .atloc | Apple Mac OS X Finder |
| .atm | Vue 3D Environment Format |
| .atmc | Adobe Type Manager |
| .atmn | Automation Anywhere Macro |
| .atmsphr | TerraGen Latmoshpere Andscape Render |
| .atn | Adobe Photoshop Actions Settings Format |
| .ato | ATO Modeler Project |
| .atom | Atom Web Feed Format |
| .atoms | Ribbons Atoms |
| .atp | Alphacam Lathe Post |
| .atpz | Automise Compressed Project |
| .atr | Atari 8-bit Disk Image |
| .atrac | Sony ATRAC Audio Format |
| .ats | Advanced ETL Processor Transformation Script Format |
| .att | Web Form Data Format |
| .attr | Apple IPhoto Image Attributes |
| .attx | Cadence Atribut |
| .atv | ACT! |
| .atx | Animation Master Plugin Format |
| .aty | Association Type Placeholder |
| .atz | Aston Compiled Theme |
| .atz3 | Automise |
| .au | Unix Audio Sound File Format |
| .au3 | AutoIt V3 Script Format |
| .au? | LoseThos Autofile |
| .auc | AUC Database |
| .aud | Westwood Studios Audio Format |
| .audiblePrefs | Audible Preference |
| .audionote | AudioNote |
| .auf | Alphacam User Font |
| .aug | Red Hat Linux Shellvars |
| .aui | AGE3D UI Editor Color Table |
| .aum | Adobe Update Manager Data |
| .aup | Audacity Project Format |
| .aupreset | Apple Logic Studio Preset |
| .aur | AutoREALM Map |
| .aurx | AutoREALM Project |
| .aus | AutoREALM Symbols |
| .aut | AutoIt Pre V3 Script Format |
| .auth | ShopSite Store Authorization |
| .autoconf | Autoconfiguration |
| .automaticdestinations-ms | Microsoft Windows 7 Jump List Format |
| .autoplay | AutoPlay Media Studio Project Format |
| .autoreg | Mozilla Application Suite Auto Registration Clue |
| .aux | TeX/LaTeX Auxiliary References Format |
| .auz | Ableton Authorization Format |
| .av | Final Draft AV Document |
| .ava | AvaaBook EBook |
| .avastconfig | Avast Configuration |
| .avastlic | Avast! License Format |
| .avastsounds | Avast! Soundpack Format |
| .avatar | Google Talk Avatar Format |
| .avb | Avid Binary Image Format |
| .avc | MPEG-4 AVC Advanced Video Coding Movie Format |
| .avchd | High Definition Video Format |
| .avd | MAGIX Movie Edit Pro Video Data Format |
| .ave | Avid User Format |
| .avenirproj | StoryMill Project Format |
| .avery | Avery Design & Print Online Label Format |
| .avf | Video Information |
| .avg | AVG Antivirus Virus Database |
| .avgdx | AVG Diagnostic Format |
| .avhd | Microsoft Hyper-V Differencing Disk Format |
| .avi | Audio Video Interleave Movie Format |
| .avj | Avira Anti-Vir Job Format |
| .avl | ArcView Legend Template Format |
| .avm | AVG Incremental Persistent |
| .avn | AltaVENTE Application User Notes |
| .avp | Avid Project Format |
| .avr | Audio Visual Research Sound Format |
| .avs | Stardent AVS X Bitmap Image Format |
| .avsi | Avisynth Script |
| .avst | VirtualDub Template |
| .avt | Savy Soda Avatar For IPhone Avatar |
| .avv | Avid Media Composer Volume Bin Format |
| .avw | AnalyzeAVW Image |
| .avx | ArcView Extension Plugin Format |
| .avz | AviSys Backup |
| .aw | Answer Wizard Format |
| .awa | ActiveWords |
| .awb | Adaptive Multi-rate Wideband ACELP Codec Audio Format |
| .awbs | Data Storage |
| .awc | Emulex AWC Firmware Update Format |
| .awcav | ActiveWorlds Browser User Avatar Format |
| .awd | Microsoft Fax Document |
| .awdb | Microsoft Works For Mac Database Format |
| .awe | Adobe Acrobat Bookmark XML |
| .awf | Adobe WorkFlow Workgroup Plugin |
| .awg | Activeworlds Object Group Format |
| .awh | ActiveWorlds Browser Help |
| .awi | AIM Widget Package |
| .awk | AWK Programming Language Script Format |
| .awkw | Awkwords Word Generator Format |
| .awl | Ad-Aware Language |
| .awlive | Active WebCam Live Capture Format |
| .awm | Likno AllWebMenus Format |
| .awp | Ability Write Document Template Format |
| .awr | Ad-Aware Reference |
| .aws | Ability Spreadsheet Spredsheet Format |
| .awshortcut | ActiveWords Shortcut |
| .awss | Microsoft Works For Mac Spreadsheet |
| .awt | AbiWord Template Document Format |
| .aww | Ability Write Document Format |
| .awwp | Microsoft Works For Mac Document |
| .awx | Microsoft DirectX |
| .awzip | ActiveWords Compressed Solution |
| .ax | DirectShow Filter Format |
| .ax3 | Apex Sketch |
| .axa | Annodex Digital Media Format |
| .axd | ASP.NET Web Handler Format |
| .axe | Microsoft Autoroute Map Format |
| .axf | ARM Executable Format |
| .axg | Microsoft AutoRoute Trip |
| .axl | XML Project |
| .axm | Axmedis Object |
| .axp | CDBurnerXP Audio Compilation Format |
| .axq | Edit Rocket Ada Editor |
| .axr | ElcomSoft Adcanced Archive Password Recovery |
| .axs | ActiveX Script |
| .axt | Adobe Photoshop Replace Color Range Format |
| .axv | Annodex Digital Media Format |
| .axw | Analyzer StateForms |
| .axx | AxCryot Encrypted Format |
| .ay | Project Format |
| .az | WinDVD Related |
| .az! | Vuze Partial Download Format |
| .aza | QazaR Archive Compressed |
| .azd | Amazon Software Download |
| .azf | Secure Format |
| .azp | Close Combat Effect |
| .azs | Secure Format |
| .azw | Amazon Kindle EBook Format |
| .azw1 | Amazon Kindle Topaz E-book Format |
| .azw2 | Amazon Kindle Program Format |
| .azw3 | Amazon Kindle EBook Format |
| .azw3f | Amazon Kindle Metadata |
| .azw3r | Amazon Kindle Metadata |
| .azw4 | Amazon Kindle Print Replica Ebook Format |
| .azz | AZZ Cardfile Information Card Format |
| .azzx | Uncompressed AZZ Cardfile Data Format |
