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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .669 | Open Source | Audio Files | UNIS Composer 669 Module | Nullsoft Winamp | Nullsoft |
| .A2M | TallStick Software | Settings Files | TS-AudioToMIDI Settings File | Nullsoft Winamp | Nullsoft |
| .AAC | Xilisoft Corporation | Audio Files | Advanced Audio Coding File | Nullsoft Winamp | Nullsoft |
| .AC3 | Various Developers | Audio Files | Audio Codec 3 File | Nullsoft Winamp | Nullsoft |
| .ACM | BioWare | Audio Files | Interplay Audio File | Nullsoft Winamp | Nullsoft |
| .AHX | Abyss | Audio Files | WinAHX Tracker Module | Nullsoft Winamp | Nullsoft |
| .AIF | Apple | Audio Files | Audio Interchange File Format | Nullsoft Winamp | Nullsoft |
| .AIFF | Apple | Audio Files | Audio Interchange File Format | Nullsoft Winamp | Nullsoft |
| .AMF | Autodesk, Inc. | 3D Image Files | Additive Manufacturing File | Nullsoft Winamp | Nullsoft |
| .APE | Nullsoft | Plugin Files | AVS Plugin Effects File | Nullsoft Winamp | Nullsoft |
| .APL | Matthew T. Ashland | Audio Files | Monkey's Audio Track Information File | Nullsoft Winamp | Nullsoft |
| .ASF | Microsoft Corporation | Video Files | Advanced Systems Format File | Nullsoft Winamp | Nullsoft |
| .ASX | Microsoft Corporation | Video Files | Microsoft ASF Redirector File | Nullsoft Winamp | Nullsoft |
| .AU | Open Source | Audio Files | Audacity Audio File | Nullsoft Winamp | Nullsoft |
| .AVI | Microsoft Corporation | Video Files | Audio Video Interleave File | Nullsoft Winamp | Nullsoft |
| .AVS | Adobe Systems Incorporated | Data Files | Adobe Photoshop Variations File | Nullsoft Winamp | Nullsoft |
| .B4S | Nullsoft | Audio Files | Winamp Playlist File | Nullsoft Winamp | Nullsoft |
| .BAM | Broad Institute | Audio Files | Bob's Adlib Music File Format | Nullsoft Winamp | Nullsoft |
| .CDA | Microsoft Corporation | Audio Files | CD Audio Track Shortcut | Nullsoft Winamp | Nullsoft |
| .CDG | Open Source | Raster Image Files | Compact Disc Plus Graphics Image | Nullsoft Winamp | Nullsoft |
| .CMF | Creative Technology Ltd. | Audio Files | Creative Music Format | Nullsoft Winamp | Nullsoft |
| .EQF | Nullsoft | Settings Files | Winamp Equalizer Preset File | Nullsoft Winamp | Nullsoft |
| .FAR | Electronic Arts | Game Files | The Sims Archive File | Nullsoft Winamp | Nullsoft |
| .FLAC | Xiph.Org | Audio Files | Free Lossless Audio Codec File | Nullsoft Winamp | Nullsoft |
| .FLV | Adobe Systems Incorporated | Video Files | Animate Video File | Nullsoft Winamp | Nullsoft |
| .GSF | Nintendo | Audio Files | Game Boy Advance Sound File | Nullsoft Winamp | Nullsoft |
| .HMI | Human Machine Interfaces | Audio Files | HMI Audio File | Nullsoft Winamp | Nullsoft |
| .HSC | Aspen Technology, Inc. | CAD Files | Aspen HYSYS Simulation File | Nullsoft Winamp | Nullsoft |
| .IMF | id Software | Audio Files | Id Music File | Nullsoft Winamp | Nullsoft |
| .IOC | Radionomy | Plugin Files | Winamp Io Plugin | Nullsoft Winamp | Nullsoft |
| .IT | Open Source | Audio Files | Impulse Tracker Module | Nullsoft Winamp | Nullsoft |
| .KAR | Various Developers | Audio Files | Karaoke MIDI File | Nullsoft Winamp | Nullsoft |
| .KRX | Various Developers | Audio Files | Karaoke MIDI File | Nullsoft Winamp | Nullsoft |
| .KSM | Pfaff | Data Files | Pfaff Embroidery Design File Format | Nullsoft Winamp | Nullsoft |
| .LA | Open Source | Audio Files | Lossless Audio File | Nullsoft Winamp | Nullsoft |
| .LAA | LucasArts Entertainment Company, LLC | Audio Files | LucasArts AdLib Audio File Format | Nullsoft Winamp | Nullsoft |
| .LDS | GNU Project | Developer Files | Binutils LD Linker Script | Nullsoft Winamp | Nullsoft |
| .LNG | Nullsoft | Plugin Files | Winamp Language File | Nullsoft Winamp | Nullsoft |
| .LRC | Various Developers | Uncommon Files | Lyrics File | Nullsoft Winamp | Nullsoft |
| .M15 | Moving Picture Experts Group | Video Files | MPEG Video File | Nullsoft Winamp | Nullsoft |
| .M2V | Webteh | Video Files | MPEG-2 Packetized Elementary Stream | Nullsoft Winamp | Nullsoft |
| .M3U | Nullsoft | Audio Files | Media Playlist File | Nullsoft Winamp | Nullsoft |
| .M3U8 | Various Developers | Audio Files | UTF-8 M3U Playlist File | Nullsoft Winamp | Nullsoft |
| .M4A | Apple | Audio Files | MPEG-4 Audio File | Nullsoft Winamp | Nullsoft |
| .M4B | Apple | Audio Files | MPEG-4 Audio Book File | Nullsoft Winamp | Nullsoft |
| .M4V | Apple | Video Files | iTunes Video File | Nullsoft Winamp | Nullsoft |
| .M75 | Moving Picture Experts Group | Video Files | MPEG Video File | Nullsoft Winamp | Nullsoft |
| .MID | Open Source | Audio Files | MIDI Audio File | Nullsoft Winamp | Nullsoft |
| .MIDI | Synthesia LLC | Audio Files | MIDI File | Nullsoft Winamp | Nullsoft |
| .MILK | Nullsoft | Plugin Files | MilkDrop Winamp Plugin Preset | Nullsoft Winamp | Nullsoft |
| .MINIPSF | Un4seen Developments | Audio Files | Miniature PlayStation Sound Format File | Nullsoft Winamp | Nullsoft |
| .MINIUSF | Nintendo | Audio Files | Nintendo 64 Song File | Nullsoft Winamp | Nullsoft |
| .MIZ | Nullsoft | Audio Files | Winamp Compressed Midi Audio | Nullsoft Winamp | Nullsoft |
| .MJF | Unknown Developer | Audio Files | Mjuice MP3 Audio File | Nullsoft Winamp | Nullsoft |
| .MOD | Open Source | Audio Files | Amiga Music Module File | Nullsoft Winamp | Nullsoft |
| .MP1 | RealNetworks | Audio Files | MPEG-1 Layer 1 Audio File | Nullsoft Winamp | Nullsoft |
| .MP2 | New World Computing | Game Files | Heroes Of Might And Magic II Map File | Nullsoft Winamp | Nullsoft |
| .MP3 | Moving Picture Experts Group | Audio Files | MP3 Audio File | Nullsoft Winamp | Nullsoft |
| .MP4 | Moving Picture Experts Group | Video Files | MPEG-4 Video File | Nullsoft Winamp | Nullsoft |
| .MP4V | Moving Picture Experts Group | Video Files | MPEG-4 Video File | Nullsoft Winamp | Nullsoft |
| .MPC | Open Source | Audio Files | Musepack Compressed Audio File | Nullsoft Winamp | Nullsoft |
| .MPE | Unknown Developer | Video Files | MPEG Movie | Nullsoft Winamp | Nullsoft |
| .MPEG | Unknown Developer | Video Files | MPEG Movie | Nullsoft Winamp | Nullsoft |
| .MPG | Moving Picture Experts Group | Video Files | MPEG Video File | Nullsoft Winamp | Nullsoft |
| .MPG4 | Moving Picture Experts Group | Video Files | MPEG-4 Video File | Nullsoft Winamp | Nullsoft |
| .MTK | Nullsoft | Audio Files | MPU-401 Trakker File | Nullsoft Winamp | Nullsoft |
| .MTM | VideoLAN | Audio Files | MultiTracker Module | Nullsoft Winamp | Nullsoft |
| .NSA | Nullsoft | Audio Files | Nullsoft Streaming Audio File | Nullsoft Winamp | Nullsoft |
| .NST | Microsoft Corporation | Data Files | Outlook Connector For Notes File | Nullsoft Winamp | Nullsoft |
| .NSV | Nullsoft | Video Files | Nullsoft Streaming Video File | Nullsoft Winamp | Nullsoft |
| .OFS | Florin Ghido | Audio Files | OptimFROG Dualstream Data | Nullsoft Winamp | Nullsoft |
| .OPUS | Open Source | Audio Files | Opus Audio File | Nullsoft Winamp | Nullsoft |
| .PLS | Various Developers | Audio Files | Audio Playlist | Nullsoft Winamp | Nullsoft |
| .PSF | Adobe Systems Incorporated | Settings Files | Photoshop Proof Settings File | Nullsoft Winamp | Nullsoft |
| .PTM | Microsoft Corporation | GIS Files | MapPoint Map File | Nullsoft Winamp | Nullsoft |
| .Q1 | Nullsoft | Settings Files | Winamp Equalizer Preset File | Nullsoft Winamp | Nullsoft |
| .Q2 | Nullsoft | Audio Files | Winamp Equalizer Auto-Load Presets File | Nullsoft Winamp | Nullsoft |
| .RBS | Microsoft Corporation | Backup Files | Windows Installer Rollback Script File | Nullsoft Winamp | Nullsoft |
| .RF64 | Radionomy | Audio Files | Winamp RIFF64 Broadcast Wave Format | Nullsoft Winamp | Nullsoft |
| .RIX | RIX SoftWorks, Inc. | Raster Image Files | ColoRIX Image File | Nullsoft Winamp | Nullsoft |
| .RMI | Open Source | Audio Files | RMID MIDI File | Nullsoft Winamp | Nullsoft |
| .ROL | Ad Lib, Inc. | Audio Files | Adlib Synthesized Instrument | Nullsoft Winamp | Nullsoft |
| .S3M | FMJ-Software | Audio Files | S3M | Nullsoft Winamp | Nullsoft |
| .S3Z | Future Crew | Audio Files | Compressed Scream Tracker 3 Module | Nullsoft Winamp | Nullsoft |
| .SA2 | Nullsoft | Audio Files | Suprise! Adlib Tracker Music Module | Nullsoft Winamp | Nullsoft |
| .SAP | Atari Corporation | Audio Files | Atari SAP Music File | Nullsoft Winamp | Nullsoft |
| .SDS | Oracle Corporation | Data Files | OpenOffice.org Chart | Nullsoft Winamp | Nullsoft |
| .SHN | Tony Robinson | Audio Files | Shorten Compressed Audio File | Nullsoft Winamp | Nullsoft |
| .SND | Open Source | Audio Files | Sound File | Nullsoft Winamp | Nullsoft |
| .SPC | Various Developers | Web Files | Software Publisher Certificate File | Nullsoft Winamp | Nullsoft |
| .SPS | IBM | Data Files | SPSS Program File | Nullsoft Winamp | Nullsoft |
| .STM | Microsoft Corporation | Data Files | Exchange Streaming Media File | Nullsoft Winamp | Nullsoft |
| .SZ | Nullsoft | Settings Files | Winamp Classic Skin Download | Nullsoft Winamp | Nullsoft |
| .TAK | K & K Associates | CAD Files | TAK 2000 Thermal Model File | Nullsoft Winamp | Nullsoft |
| .TTA | True Audio | Audio Files | True Audio File | Nullsoft Winamp | Nullsoft |
| .USF | EVGA Corporation | Settings Files | EVGA Precision X Skin File | Nullsoft Winamp | Nullsoft |
| .V2M | Farbrausch | Audio Files | V2 Synthesizer Audio File | Nullsoft Winamp | Nullsoft |
| .VAG | Sony | Audio Files | Sony Playstation/PS2 Compressed Sound File | Nullsoft Winamp | Nullsoft |
| .VGM | Richard Bannister | Audio Files | Video Game Music File | Nullsoft Winamp | Nullsoft |
| .VGZ | Various Developers | Audio Files | Video Game Music Compressed File | Nullsoft Winamp | Nullsoft |
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