| msw | Modbus Slave Workspace |
| msy | MicroSyn Data |
| msz | MediaMonkey v3 Compressed Skin |
| mt5 | Poser Material Data |
| mt940 | SWIFT MT940 Customer Statement Message |
| mta | Samsung AllShare Metadata |
| mtb | Minitab Exec File |
| mtc | BrainVoyager QX Mesh Time Course Data |
| mtf | SDL Trados Translation Memory Translations |
| mtg | Making the Grade Data |
| mth | Derive Math File |
| mto | FastCAM MTO Data |
| mtp | SpectraMagic NX Template |
| mtt | FastCAM MTO Data Template |
| mtt | MetadataTouch Template |
| mtu | Match! User Database |
| mtw | Minitab Worksheet |
| mub | ExtractNow Data |
| muc | Music Collector Collection Data |
| mud | Textease Database CT Multi-user Database |
| mudp | Active Safety System Internal Log |
| mulib | Adobe Muse Widget Library |
| musx | Minâ€Uâ€Script Xpress Data File |
| mvf | Autodesk AutoFlix Animation Data |
| mvi | Autodesk AutoCAD AutoFlix Movie Command File |
| mvl | Medison Ultrasound 3D Volume Data |
| mvm | MAGIX PhotoStory Slideshow |
| mvw | McAfee Saber LAN Log |
| mwand | GarageBand Magic Mentor Template |
| mwb | MySQL Workbench Model |
| mwc | AIBO Middleware Catalog File |
| mwf | SDL Trados Memory Word Find File |
| mwi | Medlin Payroll Software Layout Data |
| mwl | Mighty Draw Windows Library |
| mx | Mathematica Serialized Package |
