| .TSP | Inmatrix Media Solutions | Videotiedostot | Digital TV DVR Recording | Microsoft Windows | Microsoft Corporation |
| .TX_ | Microsoft Corporation | Pakatut tiedostot | Compressed TXT File | Microsoft Windows | Microsoft Corporation |
| .UCE | Microsoft Corporation | Järjestelmätiedostot | Windows UCE System File | Microsoft Windows | Microsoft Corporation |
| .VAC | Ipswitch, Inc. | Datatiedostot | IMail Server Vacation Message File | Microsoft Windows | Microsoft Corporation |
| .VBR | Microsoft Corporation | Sovelluskehittäjän tiedostot | Visual Basic Remote Automation Registration | Microsoft Windows | Microsoft Corporation |
| .VDX | Microsoft Corporation | Datatiedostot | Visio Drawing XML File | Microsoft Windows | Microsoft Corporation |
| .VGA | Microsoft Corporation | Järjestelmätiedostot | VGA Display Driver | Microsoft Windows | Microsoft Corporation |
| .VH | Microsoft Corporation | Datatiedostot | WinHelp VH Data | Microsoft Windows | Microsoft Corporation |
| .VHDX | Microsoft Corporation | Levyn kuvatiedostot | Windows 8 Virtual Hard Drive File | Microsoft Windows | Microsoft Corporation |
| .VTD | Microsoft Corporation | Datatiedostot | Microsoft VOLT Glyph Data | Microsoft Windows | Microsoft Corporation |
| .VXD | Microsoft Corporation | Järjestelmätiedostot | Windows Virtual Device Driver | Microsoft Windows | Microsoft Corporation |
| .W40 | Microsoft Corporation | Varmuuskopiointitiedostot | Windows 95 Backup File | Microsoft Windows | Microsoft Corporation |
| .W98 | Microsoft Corporation | Datatiedostot | Microsoft Windows 98 Related Data | Microsoft Windows | Microsoft Corporation |
| .WBCAT | Microsoft Corporation | Varmuuskopiointitiedostot | Microsoft Windows Backup Information | Microsoft Windows | Microsoft Corporation |
| .WDF | Workshare | Datatiedostot | Workshare Compare DeltaFile | Microsoft Windows | Microsoft Corporation |
| .WEBPNP | Microsoft Corporation | Järjestelmätiedostot | Web Point And Print File | Microsoft Windows | Microsoft Corporation |
| .WFS | Microsoft Corporation | Sovelluskehittäjän tiedostot | Microsoft Windows Installation Script | Microsoft Windows | Microsoft Corporation |
| .WLF | Microsoft Corporation | Datatiedostot | Microsoft Windows 98/Me Dr. Watson Log | Microsoft Windows | Microsoft Corporation |
| .WLL | Electronic Arts | Pelitiedostot | The Sims Wall Texture File Format | Microsoft Windows | Microsoft Corporation |
| .WPX | Microsoft Corporation | Järjestelmätiedostot | Printer Description File 2 | Microsoft Windows | Microsoft Corporation |
| .WS | MicroPro International Corp. | Tekstitiedostot | WordStar Document | Microsoft Windows | Microsoft Corporation |
| .WSH | Microsoft Corporation | Suoritettavat tiedostot | Windows Script Host Settings File | Microsoft Windows | Microsoft Corporation |
| .WSS | Microsoft Corporation | Järjestelmätiedostot | Microsoft Windows Sound System File | Microsoft Windows | Microsoft Corporation |
| .WWL | Microsoft Corporation | Laajennustiedostot | Microsoft Word Add-in File | Microsoft Windows | Microsoft Corporation |
| .WXB | Microsoft Corporation | Harvinaiset Tiedostot | Windows Miscellaneous File | Microsoft Windows | Microsoft Corporation |
| .XRM-MS | Microsoft Corporation | Järjestelmätiedostot | Microsoft Security Certificate | Microsoft Windows | Microsoft Corporation |
| .XXT | Microsoft Corporation | Järjestelmätiedostot | Dynamic Link Library | Microsoft Windows | Microsoft Corporation |
| .ZONE.IDENTIFIER | Microsoft Corporation | Järjestelmätiedostot | Microsoft Windows Zone Identifier File | Microsoft Windows | Microsoft Corporation |
| .~CU | Unknown Developer | Järjestelmätiedostot | Windows Cursor File | Microsoft Windows | Microsoft Corporation |
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