| M4A | Audio | 8 | Skype_Call_Resume.m4a |
| MAP | Game | 91 | MX_STATE.MAP |
| MAPIMAIL | System | 6 | Mail Recipient.MAPIMail |
| MAPSTYLE | Data | 1 | style.MapStyle |
| MAR | Database | 2 | signup.mar |
| MASTER | Internet Web | 30 | WebAdminWithConfirmation.master |
| MCC | Video | 10 | Microsoft Excel 95 Forum.mcc |
| MD | Developer | 4 | FilesystemMetadata.xml.md |
| MDA | Plugin | 6 | WZCNF70.MDA |
| MDB | Microsoft Access Application | 14 | ACCESS9.MDB |
| MDE | Plugin | 6 | ACWZMAIN.MDE |
| MDL | Data | 5 | ProductCascadeJDA27ptsWithLbfLowend.mdl |
| MDT | Database | 5 | WZDAT70.MDT |
| MDW | Microsoft Access Application | 1 | system.mdw |
| MDZ | Data | 42 | Music Collection.mdz |
| METADATA | Data | 2 | wininet-internet-explorer.metadata |
| MFL | Data | 607 | cliegaliases.mfl |
| MHT | Internet Web | 2 | VIDEO.MHT |
| MID | Audio | 220 | WNTER_01.MID |
| MKD | CAD | 2 | PfPre_f9cb4963.mkd |
| MLLR | Audio | 8 | l1033.mllr |
| MMF | Data | 2 | srframe.mmf |
| MML | Dynamic Link Library | 9 | CAGCAT.MML |
| MMW | Dynamic Link Library | 9 | OFFICE10.MMW |
| MNI | Data | 5 | ResCache.mni |
| MOD | Audio | 5 | OrgModel.mod |
| MODEL | CAD | 25 | en-US.PostalAddress.model |
| MOF | Text | 1427 | WdacEtwProv.mof |
| MP3 | Audio | 1 | AchievementUnlocked.mp3 |
| MSC | Executable Application | 131 | NAPCLCFG.MSC |
| MSG | Text | 7 | FPEXT.MSG |
| MSHC | Windows Help | 20 | media.mshc |
| MSHI | Windows Help | 20 | windowsclient.mshi |
| MSI | Installer | 185 | AccessMUISet.msi |
| MSO | Data | 1 | TEMPLATE.MSO |
| MSP | Windows Installer Patch | 2 | 1f047.msp |
| MSS | Developer | 3 | Aero.msstyles_1033_96.mss |
| MSSTYLES | Dynamic Link Library | 9 | aerolite.msstyles |
| MST | Executable Application | 5 | luna.mst |
| MTL | 3D Image | 1 | round.mtl |
| MUI | Dynamic Link Library | 14511 | CNBBR220.DLL.mui |
| MYDOCS | System | 6 | My Documents.mydocs |
/1 
日本語