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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 | Apple iTunes | Apple |
| .M3U | Nullsoft | Audio Files | Media Playlist File | Apple iTunes | Apple |
| .M3U8 | Various Developers | Audio Files | UTF-8 M3U Playlist File | Apple iTunes | Apple |
| .M4A | Apple | Audio Files | MPEG-4 Audio File | Apple iTunes | Apple |
| .M4B | Apple | Audio Files | MPEG-4 Audio Book File | Apple iTunes | Apple |
| .M4P | Apple | Audio Files | iTunes Music Store Audio File | Apple iTunes | Apple |
| .M4R | Apple | Audio Files | iPhone Ringtone File | Apple iTunes | Apple |
| .M4V | Apple | Video Files | iTunes Video File | Apple iTunes | Apple |
| .M75 | Moving Picture Experts Group | Video Files | MPEG Video File | Apple iTunes | Apple |
| .MBDB | Apple | Data Files | iTunes Backup Manifest Database | Apple iTunes | Apple |
| .MDBACKUP | Apple | Backup Files | iPhone Data Backup File | Apple iTunes | Apple |
| .MP1 | RealNetworks | Audio Files | MPEG-1 Layer 1 Audio File | Apple iTunes | Apple |
| .MP2 | New World Computing | Game Files | Heroes Of Might And Magic II Map File | Apple iTunes | Apple |
| .MP3 | Moving Picture Experts Group | Audio Files | MP3 Audio File | Apple iTunes | Apple |
| .MP4 | Moving Picture Experts Group | Video Files | MPEG-4 Video File | Apple iTunes | Apple |
| .MP4V | Moving Picture Experts Group | Video Files | MPEG-4 Video File | Apple iTunes | Apple |
| .MPA | Unknown Developer | Audio Files | MPEG-2 Audio File | Apple iTunes | Apple |
| .MPE | Unknown Developer | Video Files | MPEG Movie | Apple iTunes | Apple |
| .MPEG | Unknown Developer | Video Files | MPEG Movie | Apple iTunes | Apple |
| .MPG | Moving Picture Experts Group | Video Files | MPEG Video File | Apple iTunes | Apple |
| .MPG4 | Moving Picture Experts Group | Video Files | MPEG-4 Video File | Apple iTunes | Apple |
| .MPGA | RealNetworks | Audio Files | MPEG-1 Layer 3 Audio File | Apple iTunes | Apple |
| .MPR | Open Source | Data Files | Bibexcel Data | Apple iTunes | Apple |
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