| .mat |
MATLAB MAT-File |
| .mts |
AVCHD Video File |
| .mdl |
MathWorks Simulink Model |
| .mcd |
MiniCAD Design File |
| .mpq |
Blizzard Mo'PaQ File |
| .map |
Quake Engine Map File |
| .mb |
Maya Binary Project File |
| .mxf |
Material Exchange Format File |
| .mwx |
MapGuide Author Map Window XML File |
| .mwf |
MapGuide Author Map Window File |
| .menc |
Windows Mobile Encrypted File |
| .mtd |
Musicnotes Digital Sheet Music File |
| .met |
eMule Resource File |
| .m2p |
MPEG-2 Program Stream File |
| .montage |
Montage Screenplay File |
| .mgt |
Musicnotes Guitar Guru Song File |
| .mdx |
Warcraft 3 Model File |
| .mmp |
Symbian Project Specification File |
| .mddata |
iPhone Backup File |
| .mdinfo |
iPhone Backup Information File |
| .mycolors |
Stardock MyColors Theme File |
| .mpo |
Multi Picture Object File |
| .mxs |
Maxwell Studio Scene File |
| .mwb |
MySQL Workbench Document |