| M4A | Audio | 9633 | Skype_Camera_Capture_Loud.m4a |
| MAP | Game | 3408 | Acer Scan610p.map |
| MAPIMAIL | System | 7 | Mail Recipient.MAPIMail |
| MAPSTYLE | Data | 1 | style.MapStyle |
| MAR | Database | 3 | signup.mar |
| MASTER | Internet Web | 36 | webAdminNoNavBar.master |
| MCC | Video | 10 | Microsoft PowerPoint 95 Forum.mcc |
| MCXML | | 220 | proof.culture.msi.zip_proof.mcxml |
| MD | Developer | 1889 | jszip.md |
| MDA | Plugin | 6 | WZLIB70.MDA |
| MDB | Microsoft Access Application | 65 | DateBook.mdb |
| MDE | Plugin | 6 | ACWZLIB.MDE |
| MDL | Data | 124 | police.mdl |
| MDT | Database | 5 | ACWZUSR.MDT |
| MDW | Microsoft Access Application | 1 | system.mdw |
| MDZ | Data | 42 | Video Collection.mdz |
| METADATA | Data | 17 | goog-unwanted-proto.metadata |
| MFL | Data | 1227 | auxiliarydisplaycpl.mfl |
| MHT | Internet Web | 63 | site.mht |
| MIB | | 1 | Makefile.mib |
| MID | Audio | 2350 | fpc_hiphop_68.mid |
| MKD | CAD | 1020 | PfPre_a4c104d9.mkd |
| MLLR | Audio | 8 | l1033.mllr |
| MMF | Data | 2 | srframe.mmf |
| MML | Dynamic Link Library | 33 | CAGCAT.MML |
| MMW | Dynamic Link Library | 33 | CAGCAT10.MMW |
| MNI | Data | 6 | ResCache.mni |
| MOD | Audio | 88 | dtypes.mod |
| MODEL | CAD | 723 | fr-FR.PhoneNumber.model |
| MOF | Text | 1650 | rspndr.mof |
| MP3 | Audio | 2115 | BEAU0005.mp3 |
| MSC | Executable Application | 153 | gpedit.msc |
| MSG | Text | 587 | ja.msg |
| MSHC | Windows Help | 24 | dev10.mshc |
| MSHI | Windows Help | 20 | windowsclient.mshi |
| MSI | Installer | 869 | soda-desktop-ocr-module-9.3.18.38737-x64.msi |
| MSO | Data | 2 | extension.mso |
| MSP | Windows Installer Patch | 55 | 1f02f.msp |
| MSS | Developer | 3 | Aero.msstyles_2057_96.mss |
| MSSTYLES | Dynamic Link Library | 18 | Blade.msstyles |
| MST | Executable Application | 728 | 1035.mst |
| MSU | | 126 | Windows8-RT-KB2999226-x86.msu |
| MTL | 3D Image | 174 | VWGOLF1_dr01_1.MTL |
| MUI | Dynamic Link Library | 138887 | CNBBR140.DLL.mui |
| MYDOCS | System | 6 | My Documents.mydocs |
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