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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .10 | IBM | Audio Files | IBM Voice Type Languages Scripts Data File | Mozilla Firefox | Mozilla |
| .2 | IBM | Audio Files | IBM Embedded ViaVoice Voice Type Languages Scripts Data File Format | IBM Embedded ViaVoice | IBM |
| .2CH | SourceForge | Audio Files | Super Audio CD Track | Super Audio CD Decoder | SourceForge |
| .32 | Ubisoft | Audio Files | Salt Lake Winter Olympics 2002 Music Data | Salt Lake 2002 | Ubisoft |
| .3GA | Open Source | Audio Files | 3GPP Audio File | Apple QuickTime Player | Apple |
| .3GPA | Open Source | Audio Files | 3GPP Multimedia File | MPlayer | The MPlayer Team |
| .3P2 | Open Source | Audio Files | 3GPP Multimedia File | MPlayer | The MPlayer Team |
| .404 | Muon Software | Audio Files | Muon DS404 Audio Bank | Awave Studio | FMJ-Software |
| .42 | Ubisoft | Audio Files | Salt Lake Winter Olympics 2002 Music Data | Salt Lake 2002 | Ubisoft |
| .4V | Apogee Electronics | Audio Files | Quartet Music File | Quartet | Apogee Electronics |
| .669 | Open Source | Audio Files | UNIS Composer 669 Module | Nullsoft Winamp | Nullsoft |
| .8CM | Fredrik "Mr. H" Huss and Magnus "Vogue" Högdahl | Audio Files | Triton FastTracker 8 Channel Music Module File | Fasttracker | Starbreeze Studios |
| .8MED | Norman Franke | Audio Files | Amiga OctaMed Music File | SoundApp | Norman Franke |
| .A2M | TallStick Software | Audio Files | TS-AudioToMIDI Settings File | TS-AudioToMIDI | TallStick Software |
| .A2P | Adlib Tracker II | Audio Files | Adlib Tracker II Pattern File | Adlib Tracker II | Adlib Tracker II |
| .A2W | Carnegie Mellon University | Audio Files | Alice World | Alice | Carnegie Mellon University |
| .A3K | Yamaha Corporation | Audio Files | Yamaha A3000 Sampler Data | Yamaha A3000 | Yamaha Corporation |
| .A52 | Atari Corporation | Audio Files | Atari 5200 ROM | MESS | Open Source |
| .AA | Audible | Audio Files | Audible Audio Book File | Apple iTunes | Apple |
| .AA3 | Sony | Audio Files | ATRAC Audio File | MAGIX Vegas | Magix Software GmbH |
| .AAC | Xilisoft Corporation | Audio Files | Advanced Audio Coding File | Apple iTunes | Apple |
| .AAX | Audible | Audio Files | Audible Enhanced Audiobook File | Apple iTunes | Apple |
| .ABC | Adobe Systems Incorporated | Audio Files | ActionScript Byte Code File | Adobe Flash Player | Adobe Systems Incorporated |
| .ABM | Unknown Developer | Audio Files | Music Album | Redbana Audition | Redbana |
| .AC3 | Various Developers | Audio Files | Audio Codec 3 File | CyberLink PowerDVD | CyberLink |
| .AC7 | National Instruments | Audio Files | SPICE AC/Frequency Domain Output File | Spice | National Instruments |
| .ACD | Sony Creative Software | Audio Files | ACID Project File | ACID XPress | Sony |
| .ACM | BioWare | Audio Files | Interplay Audio File | Nullsoft Winamp | Nullsoft |
| .ACP | Alfresco Software, Inc. | Audio Files | Alfresco Content Package | Alfresco | Alfresco Software, Inc. |
| .ACT | Bell Labs | Audio Files | ADPCM Compressed Audio File | Unknown Software | Unknown Developer |
| .AD2 | Unknown Developer | Audio Files | ADPCM 2-bit Compressed Voice | Awave Studio | FMJ-Software |
| .AD3 | Open Source | Audio Files | ADPCM 3-bit Compressed Voice | SoX | Open Source |
| .ADE | Microsoft Corporation | Audio Files | Access Project Extension | Microsoft Access | Microsoft Corporation |
| .ADPCM | Microsoft Corporation | Audio Files | ADPCM Audio | Microsoft Windows Media Player | Microsoft Corporation |
| .ADT | Swiftpage, Inc. | Audio Files | ACT! Document Template | Swiftpage Act | Swiftpage, Inc. |
| .ADTS | Shedworx | Audio Files | Audio Data Transport Stream File | Microsoft Windows Media Player | Microsoft Corporation |
| .ADV | Unknown Developer | Audio Files | Audio Driver File | Dune | Cryo Interactive Entertainment |
| .ADX | CRI Middleware | Audio Files | ADX Audio File | FFmpeg | FFmpeg team |
| .AFC | Electronic Arts | Audio Files | Mass Effect 2 Audio File | Mass Effect 2 | BioWare |
| .AGM | Digital Theater Systems (DTS) Inc. | Audio Files | DTS Multi-channel Pro Packer File | DTS Pro Series Surround Encoder | Digital Theater Systems (DTS) Inc. |
| .AGR | Ableton | Audio Files | Ableton Groove File | Ableton Live | Ableton |
| .AHX | Abyss | Audio Files | WinAHX Tracker Module | CocoModX | Open Source |
| .AIF | Apple | Audio Files | Audio Interchange File Format | Microsoft Windows Media Player | Microsoft Corporation |
| .AIFC | Apple | Audio Files | Compressed Audio Interchange File | Microsoft Windows Media Player | Microsoft Corporation |
| .AIFF | Apple | Audio Files | Audio Interchange File Format | Microsoft Windows Media Player | Microsoft Corporation |
| .AIS | Extreme | Audio Files | Velvet Studio Instrument | Velvet Studio | Extreme |
| .AIX | Unknown Developer | Audio Files | AIX Audio File | adXtract | Halley's Comet Software |
| .AJZ | Archos | Audio Files | Archos Jukebox Recorder Firmware Update | Archos' Jukebox Recorder | Archos |
| .AKP | Propellerhead | Audio Files | Akai Sampler File | ReCycle | Propellerhead |
| .AL | ITU-T (International Telecommunication Union, Telecommunication Standardization Sector) | Audio Files | A-Law Compressed Sound Format | Apple QuickTime Player | Apple |
| .ALAW | ITU-T (International Telecommunication Union, Telecommunication Standardization Sector) | Audio Files | A-Law Compressed Sound Format | Apple QuickTime Player | Apple |
| .ALC | Ableton | Audio Files | Ableton Live Clip File | Ableton Live | Ableton |
| .ALL | Steinberg | Audio Files | Cubase Project | Steinberg Cubase | Steinberg |
| .ALS | Ableton | Audio Files | Ableton Live Set File | Ableton Live | Ableton |
| .AMF | Autodesk, Inc. | Audio Files | Additive Manufacturing File | Autodesk Meshmixer | Autodesk, Inc. |
| .AML | Intel Corporation | Audio Files | ACPI Machine Language File | DSDTSE | otRock |
| .AMR | Open Source | Audio Files | Adaptive Multi-Rate Codec File | Apple QuickTime Player | Apple |
| .AMS | Adobe Systems Incorporated | Audio Files | Adobe Monitor Setup File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .ANG | Anghami | Audio Files | Anghami Audio File | Anghami | Anghami |
| .AOB | Unknown Developer | Audio Files | DVD-Audio Audio Object File | CyberLink PowerDVD | CyberLink |
| .APE | Nullsoft | Audio Files | AVS Plugin Effects File | Nullsoft Winamp | Nullsoft |
| .APF | Adobe Systems Incorporated | Audio Files | Adobe Profile File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .APL | Matthew T. Ashland | Audio Files | Monkey's Audio Track Information File | Microsoft Windows Media Player | Microsoft Corporation |
| .ARL | AOL | Audio Files | AOL Organizer File | AOL Organizer | AOL |
| .ARR | Lemkesoft | Audio Files | Amber Graphic File | Lemkesoft GraphicConverter | Lemkesoft |
| .ARS | Adobe Systems Incorporated | Audio Files | After Effects Render Settings File | Adobe After Effects | Adobe Systems Incorporated |
| .ASC | Symantec Corporation | Audio Files | PGP (Pretty Good Privacy) ASCII Armored File | Mozilla Thunderbird | Mozilla |
| .ASD | Microsoft Corporation | Audio Files | Word AutoSave File | Microsoft Word | Microsoft Corporation |
| .ASE | Adobe Systems Incorporated | Audio Files | Adobe Swatch Exchange File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .AT3 | Sony | Audio Files | ATRAC3 Audio File | MAGIX Vegas | Magix Software GmbH |
| .AU | Open Source | Audio Files | Audacity Audio File | Audacity | Open Source |
| .AUD | Interscape | Audio Files | Video Game Compressed Audio File | Command and Conquer | Interscape |
| .AUF | Planit Solutions, Inc. | Audio Files | Alphacam User Font | Planit Alphacam | Planit Solutions, Inc. |
| .AUP | Open Source | Audio Files | Audacity Project Audio File | Audacity | Open Source |
| .AWB | Nokia | Audio Files | AMR-WB Audio File | Apple QuickTime Player | Apple |
| .AXA | CSIRO | Audio Files | Annodex Audio File | VLC Media Player | VideoLAN |
| .AY | Richard Bannister | Audio Files | AY Chiptune File | Audio Overload | Richard Bannister |
| .AZX | Unknown Developer | Audio Files | ZX Audio File Format | Unknown Software | Unknown Developer |
| .B4S | Nullsoft | Audio Files | Winamp Playlist File | Nullsoft Winamp | Nullsoft |
| .BAM | Broad Institute | Audio Files | Bob's Adlib Music File Format | Nullsoft Winamp | Nullsoft |
| .BAND | Apple | Audio Files | GarageBand Project File | Apple GarageBand 10 | Apple |
| .BAP | Blaze Audio | Audio Files | Blaze Audio Wave Information File | Blaze Audio RipEditBurn | Blaze Audio |
| .BBZ | BitBlaze | Audio Files | Bitblaze Audio File | Unknown Software | Unknown Developer |
| .BCS | The Wavelength | Audio Files | Batch Compiler Specification File | Batch Compiler | The Wavelength |
| .BDD | CARA Software | Audio Files | CARA Sound Radiation Data File | CARA Loudspeaker Editor | CARA Software |
| .BMM | Isao Maruoka | Audio Files | Tacmi Pixia Palette | Pixia | Isao Maruoka |
| .BMTP | Bome Software | Audio Files | Bome's Midi Translator Project File | Bome's Midi Translator | Bome Software |
| .BMU | BioWare | Audio Files | BioWare Music Unit | Baldur's Gate | BioWare |
| .BMW | Buzz Tools | Audio Files | BuzzPlay Music With Waves | Buzz | Buzz Tools |
| .BN | Unknown Developer | Audio Files | Adlib Instrument Bank | Adlib Tracker II | Adlib Tracker II |
| .BNK | Unknown Developer | Audio Files | Adlib Instrument Bank | Adlib Tracker II | Adlib Tracker II |
| .BOX | Unknown Developer | Audio Files | E-mail Mailbox | Mozilla Thunderbird | Mozilla |
| .BR28 | BMW | Audio Files | BMW iDrive Multimedia Data | BMW iDrive | BMW |
| .BR3 | DAZ 3D | Audio Files | Bryce 3 Scene File | DAZ 3D Bryce | DAZ 3D |
| .BR4 | DAZ 3D | Audio Files | Bryce 4 Scene File | DAZ 3D Bryce | DAZ 3D |
| .BRSTM | Open Source | Audio Files | Binary Revolution Stream Audio File | BrawlBox | Open Source |
| .BSL | Webteh | Audio Files | BSPlayer Playlist File | BS.player | Webteh |
| .BUN | Roland Corporation | Audio Files | Cakewalk Bundle File | Cakewalk SONAR | Cakewalk, Inc. |
| .BVF | Interscape | Audio Files | iRock Digital Voice Recorder Audio Data | irock! 100 Series Voice & Audio Manager | Interscape |
| .BWG | Noromaa Solutions | Audio Files | BrainWave Generator Audio File | BrainWave Generator | Noromaa Solutions |
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