| Abbreviation | Definition |
|---|---|
| MINDS | Multiple Intelligent Node Document Servers |
| MIS | Mission file (games) |
| MITSU | Mitsubishi S340-10 color sublimation printer file |
| MIX | Object file (Power C) |
| MJP | Media Jukebox File |
| MK | Makefile |
| MKE | Makefile ( Microsoft Windows SDK) |
| MKG | Makefile |
| MKI | Japanese graphics MAKIchan format ( MagView 0.5) |
| MKS | Data (TACT) |
| MKV | Matroska Video |
| ML | ML language source code file |
| ML3 | Project (Milestones 3.x) |
| MLB | Macro library file (Symphony) |
| MLI | Materials libraries (3D Studio) |
| MLM | Saved email (Novell GroupWise using WP5.1 format) |
| MM | Macro Module |
| MM | Meme Virtual reality world file |
| MM | MultiMate Advantage II Text document |
| MM | Musicbrainz Metadata |