| mto | FastCAM MTO Data |
| mtp | SpectraMagic NX Template |
| mtst | MotionTracking RAW Image Stack Data |
| mtt | FastCAM MTO Data Template |
| mtt | MetadataTouch Template |
| mttfs | MadgeTech 4 Report Data |
| mtu | Match! User Database |
| mtw | Minitab Worksheet |
| mub | ExtractNow Data |
| muc | Music Collector Collection Data |
| mucow | Adobe Muse Configurable Options Widget |
| mud | Textease Database CT Multi-user Database |
| mudp | Active Safety System Internal Log |
| mulib | Adobe Muse Widget Library |
| mult | SAM Multiple Domain Alignment Output |
| muphlp | MuPAD Help Data |
| murl | Maxthon Browser URL Data |
| musx | Min-U-Script Xpress Data File |
| mut | Integrative Genomics Viewer Mutations List |
| mvf | Autodesk AutoFlix Animation Data |
| mvhlink | MyVirtualHome Link Data |
| mvi | Autodesk AutoCAD AutoFlix Movie Command File |
| mvl | Medison Ultrasound 3D Volume Data |
| mvm | MAGIX PhotoStory Slideshow |
| mvn | Xsens MVN Data |
| mvna | Xsens MVN Subject Dimensions Data |
| mvns | Xsens MVN Session Data |
| mvnx | Xsens MVN Exported XML Data |
| mvr | IBM HotMedia Multimedia Data |
| mvw | McAfee Saber LAN Log |
| mw2s | MacWrite II Model Data |
| mwand | GarageBand Magic Mentor Template |
| mwb | MySQL Workbench Model |
| mwc | AIBO Middleware Catalog File |
| mwdeck | Magic Workstation Deck Data |