| mg8 | Band-in-a-Box Song |
| mg9 | Band-in-a-Box Song |
| mgb | Paragon 5 Gameboy Tracker Audio |
| mgu | Band-in-a-Box Song |
| mgv | Yamaha MegaVoice Audio |
| mia | MusicIndiaOnline Trident Player Music |
| mid | MIDI Music |
| midi | MIDI Music |
| mini2sf | Nintendo DS Sound Information Data |
| 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 |
| mkii | Mark II Sound-System Audio Data |
| mkj | MKJamz Audio File |
| mkw | MKW Compressed Audio |
| ml | MusicLineEditor Audio Data |
| mld | MFi Phone Ringtone |
| mlp | Meridian Lossless Packing Audio |
| mls | Miles Sound System Compressed DLS Data |
| mm4 | MusicMaker V8 Audio |
| mm8 | MusicMaker V8 Audio |
| mmf | SMAF Audio |
| mo3 | MO3 Audio |
| mod | Music Module MOD |
| mogg | Multitrack OGG Audio |
| moh | IMS Music on Hold Data |
| mon | Maniacs of Noise Audio Data |
