| mbnk | Miles Sound System 10 Audio Bank |
| mbnk_digest | Miles Sound System 10 Bank Digest Data |
| mcg | Compressed CD+G Karaoke File |
| mct | Musicator Music |
| mdi | MIDI Music |
| mdl | Digitrakker Music Module |
| mdx | Sharp X68000 Audio Data |
| med | OctaMED Music Module |
| mf3 | Ensoniq MR 76 Audio Data |
| mfb | Ensoniq MR 76 Audio Data |
| mg1 | Band-in-a-Box Song |
| mg2 | Band-in-a-Box Song |
| mg3 | Band-in-a-Box Song |
| mg4 | Band-in-a-Box Song |
| mg5 | Band-in-a-Box Song |
| mg6 | Band-in-a-Box Song |
| mg7 | Band-in-a-Box Song |
| 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 |