| .MAC | Apple | Fişiere de imagini rastru | MacPaint Image | Apple QuickTime Player | Apple |
| .MAT | MathWorks | Fişiere de imagini rastru | MATLAB MAT-File | The MathWorks MATLAB | MathWorks |
| .MAX | Autodesk, Inc. | Fişiere de imagini rastru | 3ds Max Scene File | Autodesk 3ds Max | Autodesk, Inc. |
| .MBM | Squad | Fişiere de imagini rastru | Kerbal Space Program Texture File | Squad Kerbal Space Program | Squad |
| .MCS | Mathsoft | Fişiere de imagini rastru | Mathcad Image | Mathcad | PTC |
| .MET | Emulex Corporation | Fişiere de imagini rastru | eMule Resource File | eMule | Open Source |
| .MIC | Microsoft Corporation | Fişiere de imagini rastru | Image Composer File | Microsoft Image Composer | Microsoft Corporation |
| .MIP | Corel | Fişiere de imagini rastru | Multiple Image Print File | PaintShop Pro | Corel |
| .MIX | Microsoft Corporation | Fişiere de imagini rastru | Microsoft Image Exchange File | Microsoft Picture It! | Microsoft Corporation |
| .MKI | Unknown Developer | Fişiere de imagini rastru | MAKIchan Graphics File | XnView MP | XnSoft |
| .MMR | Fuji Xerox | Fişiere de imagini rastru | Fuji Xerox Fax Image | FaxSee Pro | SFaxTools |
| .MNG | Various Developers | Fişiere de imagini rastru | Multiple Network Graphic | Mozilla Firefox | Mozilla |
| .MNR | Autodesk, Inc. | Fişiere de imagini rastru | AutoCAD Menu Resource File | Autodesk AutoCAD | Autodesk, Inc. |
| .MON | Mozilla | Fişiere de imagini rastru | Firefox Monday Bookmark Backup File | Mozilla Firefox | Mozilla |
| .MPC | Open Source | Fişiere de imagini rastru | Musepack Compressed Audio File | VLC Media Player | VideoLAN |
| .MPF | Microsoft Corporation | Fişiere de imagini rastru | Microsoft Media Package File | Microsoft Clip Organizer | Microsoft Corporation |
| .MPO | CyberLink | Fişiere de imagini rastru | CIPA Multi Picture Object File | Adobe Photoshop | Adobe Systems Incorporated |
| .MRB | Microsoft Corporation | Fişiere de imagini rastru | Multiple Resolution Bitmap File | Microsoft Visual C++ | Microsoft Corporation |
| .MRC | mIRC Co. Ltd | Fişiere de imagini rastru | mIRC Script File | mIRC | mIRC Co. Ltd |
| .MRF | Apple | Fişiere de imagini rastru | Macintosh Font File | Apple OS X | Apple |
| .MSK | Corel | Fişiere de imagini rastru | Paint Shop Pro Mask File | PaintShop Pro | Corel |
| .MSP | Microsoft Corporation | Fişiere de imagini rastru | Windows Installer Patch | Windows Installer | Microsoft Corporation |
| .MVM | Magix Software GmbH | Fişiere de imagini rastru | MAGIX PhotoStory On DVD Slideshow | MAGIX Photostory 2016 Deluxe | Magix Software GmbH |
| .MXI | Adobe Systems Incorporated | Fişiere de imagini rastru | Adobe Extension Information File | Adobe InCopy | Adobe Systems Incorporated |
| .MYL | Avanquest Software | Fişiere de imagini rastru | MyLogo Maker Image | Avanquest MyLogo Maker | Avanquest Software |
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