| M4A | Audio | 9633 | Skype_File_Transfer_Incoming.m4a |
| MAP | Game | 3408 | sample13.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 Access 95 Forum.mcc |
| MCXML | | 220 | onenote.x-none.msi.zip_onenote_wow6432.mcxml |
| MD | Developer | 1889 | CHANGELOG.md |
| MDA | Plugin | 6 | WZCNF70.MDA |
| MDB | Microsoft Access Application | 65 | DB - Access.mdb |
| MDE | Plugin | 6 | ACWZMAIN.MDE |
| MDL | Data | 124 | w_rif_ak47.mdl |
| MDT | Database | 5 | ACWZUSR.MDT |
| MDW | Microsoft Access Application | 1 | system.mdw |
| MDZ | Data | 42 | Inventory Control.mdz |
| METADATA | Data | 17 | wininet-internet-explorer.metadata |
| MFL | Data | 1227 | netnccim.mfl |
| MHT | Internet Web | 63 | new_playlist.mht |
| MIB | | 1 | Makefile.mib |
| MID | Audio | 2350 | MUSIC9.MID |
| MKD | CAD | 1020 | PfPre_f9cb4963.mkd |
| MLLR | Audio | 8 | l2057.mllr |
| MMF | Data | 2 | srframe.mmf |
| MML | Dynamic Link Library | 33 | CAGCAT10.MML |
| MMW | Dynamic Link Library | 33 | CAGCAT10.MMW |
| MNI | Data | 6 | ResCache.mni |
| MOD | Audio | 88 | dbgenent.mod |
| MODEL | CAD | 723 | Url.model |
| MOF | Text | 1650 | WFP.MOF |
| MP3 | Audio | 2115 | Big_Band_Bash.mp3 |
| MSC | Executable Application | 153 | Data61x4_2_2.msc |
| MSG | Text | 587 | ar_jo.msg |
| MSHC | Windows Help | 24 | Help3Branding.mshc |
| MSHI | Windows Help | 20 | resources.mshi |
| MSI | Installer | 869 | HPZBDI32.msi |
| MSO | Data | 2 | extension.mso |
| MSP | Windows Installer Patch | 55 | AcroRdrDCUpd1901220036.msp |
| MSS | Developer | 3 | Aero.msstyles_1033_96_01.mss |
| MSSTYLES | Dynamic Link Library | 18 | Blade.msstyles |
| MST | Executable Application | 728 | 1066.mst |
| MSU | | 126 | Windows6.0-KB958655-v2-x64.msu |
| MTL | 3D Image | 174 | Comet_Racing_r_hl.MTL |
| MUI | Dynamic Link Library | 138887 | drprov.dll.mui |
| MYDOCS | System | 6 | My Documents.mydocs |
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