| .M3R | Autodesk, Inc. | Fişiere de date | Autodesk Moldflow 3D Fill+Pack Restart Data | Moldflow Communicator | Autodesk, Inc. |
| .MA | Autodesk, Inc. | Fişiere de imagini 3D | Maya Project File | Autodesk Maya | Autodesk, Inc. |
| .MAJ | Autodesk, Inc. | Fişiere de date | Camduct Job File | Autodesk Fabrication CAMduct | Autodesk, Inc. |
| .MAT | MathWorks | Fişiere de date | MATLAB MAT-File | Autodesk 3ds Max | Autodesk, Inc. |
| .MAX | Autodesk, Inc. | Fişiere de imagini 3D | 3ds Max Scene File | Autodesk 3ds Max | Autodesk, Inc. |
| .MB | Autodesk, Inc. | Fişiere de imagini 3D | Maya Binary Project File | Autodesk Maya | Autodesk, Inc. |
| .MCR | Mojang | Fişiere de jocuri | Minecraft Region File | Autodesk 3ds Max | Autodesk, Inc. |
| .MEL | Autodesk, Inc. | Fişiere executabile | Maya Embedded Language File | Autodesk Maya | Autodesk, Inc. |
| .MFR | Autodesk, Inc. | Fişiere de date | Autodesk Moldflow Result Data | Moldflow Communicator | Autodesk, Inc. |
| .MIX | Microsoft Corporation | Fişiere de imagini rastru | Microsoft Image Exchange File | Autodesk 3ds Max | Autodesk, Inc. |
| .MLF | Autodesk, Inc. | Fișiere grafice | Autodesk Mapguide Layer Data | MapGuide Open Source | Autodesk, Inc. |
| .MLI | Unknown Developer | Fişiere de date | Encyclopedia Media List | Autodesk 3ds Max | Autodesk, Inc. |
| .MLL | Autodesk, Inc. | Fişiere plugin | Autodesk Maya Plug-in | Autodesk Maya | Autodesk, Inc. |
| .MLN | Autodesk, Inc. | Fişiere de date | AutoCAD Multiline Definition Data File | Autodesk AutoCAD | Autodesk, Inc. |
| .MNC | Autodesk, Inc. | Fişiere criptate | AutoCAD Compiled Menu File | Autodesk AutoCAD | Autodesk, Inc. |
| .MND | Autodesk, Inc. | Fişiere de programator | AutoCAD Menu Compiler File | Autodesk AutoCAD | Autodesk, Inc. |
| .MNL | Autodesk, Inc. | Fișiere neobișnuite | AutoCAD Menu LISP File | Autodesk AutoCAD | Autodesk, Inc. |
| .MNR | Autodesk, Inc. | Fişiere de imagini rastru | AutoCAD Menu Resource File | Autodesk AutoCAD | Autodesk, Inc. |
| .MNS | Autodesk, Inc. | Fişiere de setări | AutoCAD Interface Settings File | Autodesk AutoCAD | Autodesk, Inc. |
| .MNU | Autodesk, Inc. | Fişiere de setări | AutoCAD Interface Layout File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .MNX | Autodesk, Inc. | Fişiere criptate | AutoCAD Compiled Menu File | Autodesk AutoCAD | Autodesk, Inc. |
| .MP | Autodesk, Inc. | Fişiere de imagini 3D | Maya PLE Project File | Autodesk Maya | Autodesk, Inc. |
| .MPR | Open Source | Fişiere de date | Bibexcel Data | Autodesk AutoCAD | Autodesk, Inc. |
| .MS | Next Limit Technologies | Fişiere executabile | Maxwell Script | Autodesk 3ds Max | Autodesk, Inc. |
| .MSE | CyberLink | Fişiere video | MediaShow Slideshow Project File | Autodesk 3ds Max | Autodesk, Inc. |
| .MSK | Corel | Fişiere de imagini rastru | Paint Shop Pro Mask File | Autodesk Animator | Autodesk, Inc. |
| .MTL | TurboCAD | Fişiere de imagini 3D | OBJ Material File | Autodesk Maya | Autodesk, Inc. |
| .MUD | Autodesk, Inc. | Fişiere de imagini 3D | Mudbox 3D Scene File | Autodesk Mudbox 2017 | Autodesk, Inc. |
| .MVI | Autodesk, Inc. | Fișiere neobișnuite | Autodesk AutoCAD Movie Command File | AutoFlix | Autodesk, Inc. |
| .MWF | Autodesk, Inc. | Fişiere de date | MapGuide Author Map Window File | Infrastructure Map Server | Autodesk, Inc. |
| .MZP | Autodesk, Inc. | Fişiere comprimate | MAXScript Zip Package | Autodesk 3ds Max | Autodesk, Inc. |
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