| mgv | Yamaha MegaVoice Audio |
| mia | MusicIndiaOnline Trident Player Music |
| mid | MIDI Music |
| midi | MIDI Music |
| minigsf | Game Boy Advance GSF Song |
| minipsf | Miniature Portable Sound Format Data |
| miniusf | Nintendo 64 Song |
| mjf | Mjuice Secure Music File |
| mka | Matroska Audio |
| mkf | KaraBox Karaoke Audio |
| mkj | MKJamz Audio File |
| mkw | MKW Compressed Audio |
| mld | MFi Phone Ringtone |
| mlp | Meridian Lossless Packing Audio |
| mmf | SMAF Audio |
| mo3 | MO3 Audio |
| mod | Music Module MOD |
| mogg | Multitrack OGG Audio |
| moh | IMS Music on Hold Data |
| mp1 | MPEG Audio Layer 1 File |
| mp2 | Mpeg-1 Audio Layer 2 File |
| mp2a | Mpeg-2 Audio |
| mp3 | MPEG Audio Layer 3 File |
| mp3g | MP3+G Karaoke File |
| mp4 | Mpeg-4 Audio |
| mp4a | Mpeg-4 Audio |
| mpa | Mpeg Audio File |
| mpeg3 | MPEG Audio Layer 3 File |
| mpga | MPEG Audio Layer 3 File |
| mptm | OpenMPT Module |
| mptmz | OpenMPT Compressed Module |
| mpy | RCA Lyra Audio File |
| mqf | Yamaha MidRadio Player Audio |
| msc | AdLib MSCplay Music |
| mstr | Miles Sound System 10 Stream Bank |