| Расширение | Форматы | К-ство форматов |
|---|---|---|
| m2ts | Blu-ray BDAV Video File | 1 |
| m3d | 3D Model File | 1 |
| m3u | MP3 songs playlist file | 1 |
| m4a | MPEG-4 Audio File | 1 |
| m4b | MPEG-4 Audio Book File | 1 |
| m4v | MPEG-4 iTunes Video File | 1 |
| map | Atlas MapMaker geographical map | 1 |
| max | 3D Studio Max scene file | 1 |
| mb | Maya Binary Project File | 1 |
| mcd | MathCAD Document File, MiniCAD (VectorWorks) Drawing File | 2 |
| mcdx | Mathcad Prime Document | 1 |
| md | Markdown Documentation File , Machine Description, MDCD Compressed Archive, Moneydance Financial Data File | 4 |
| md5 | MD5 Checksum File | 1 |
| mdb | Microsoft Access Database, Avid Media Database | 2 |
| mdf | Media Disc Image File | 1 |
| mdi | Microsoft Office Document Imaging file format | 1 |
| mdl | MathWorks Simulink Model, Half-Life (Quake) Model File, Rational Rose Model File, Warcraft 3 3D Model Text File, Flight Simulator Airplane Model | 5 |
| mdmp | Minidump Windows | 1 |
| mds | Alcohol 120% Image file format | 1 |
| mdx | Media Data eXtended image file | 1 |