| .mswmm |
Windows Movie Maker Project |
| .mp |
LaTeX MetaPost File |
| .mrw |
Minolta Raw Image File |
| .mix |
Command & Conquer Data File |
| .msm |
Windows Installer Merge Module |
| .mds |
TestComplete Project File |
| .md0 |
Alcohol Disk Image Segment 1 |
| .mht |
MHTML Web Archive |
| .mmap |
MindManager Map File |
| .mui |
Myriad User Instrument File |
| .mbm |
Kerbal Space Program Texture File |
| .mka |
Matroska Audio File |
| .mfo |
Perl ModInfo Descriptor File |
| .mbp |
Mobipocket Notes File |
| .mc6 |
Poser Material Collection File |
| .mrs |
GunZ Game Data File |
| .m2ts |
Blu-ray BDAV Video File |
| .m2t |
HDV Video File |
| .msu |
Windows Vista Update Package |
| .mzp |
MAXScript Zip Package |
| .mcr |
Minecraft Region File |
| .mse |
MediaShow Slideshow Project File |
| .mpt |
Microsoft Project Template |
| .mtv |
MTV Video Format File |