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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .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 |
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