| .VMP | Sony | Arquivos de sistema | Logos Library System 2.x Verse Map | VAIO Movie Creator | Sony |
| .VRS | Corel | Arquivos de sistema | Corel WordPerfect Video Device Driver | Corel WordPerfect | Corel |
| .VXD | Microsoft Corporation | Arquivos de sistema | Windows Virtual Device Driver | Microsoft Windows | Microsoft Corporation |
| .VXX | Unknown Developer | Arquivos de sistema | IOsubsys | Unknown Software | Unknown Developer |
| .W31 | Microsoft Corporation | Arquivos de sistema | Windows 3.1 Startup Data | Microsoft Windows 3.x | Microsoft Corporation |
| .WCF | Microsoft Corporation | Arquivos de sistema | WebEx Saved Chat Session | Microsoft Notepad | Microsoft Corporation |
| .WDF | Workshare | Arquivos de sistema | Workshare Compare DeltaFile | Workshare Compare | Workshare |
| .WDGT | Opera Software | Arquivos de sistema | Opera Widget File | Opera | Opera Software |
| .WDPROJ | Microsoft Corporation | Arquivos de sistema | Microsoft Visual Studio Web Deployment Project File | Microsoft Visual Studio | Microsoft Corporation |
| .WDR | Psion PLC | Arquivos de sistema | Psion Series 3 Printer Driver | Symbian OS | Nokia |
| .WEBPNP | Microsoft Corporation | Arquivos de sistema | Web Point And Print File | Microsoft Windows | Microsoft Corporation |
| .WGZ | Nokia | Arquivos de sistema | S60 Web Runtime Widget Package | Nokia PC Suite | Nokia |
| .WPH | Phoenix Technologies | Arquivos de sistema | Phoenix BIOS File | Phlash16.exe | Phoenix Technologies |
| .WPX | Microsoft Corporation | Arquivos de sistema | Printer Description File 2 | Microsoft Windows | Microsoft Corporation |
| .WRS | Corel Corporation | Arquivos de sistema | Corel WordPerfect Windows Printer Driver File | Corel WordPerfect X8 | Corel |
| .WSS | Microsoft Corporation | Arquivos de sistema | Microsoft Windows Sound System File | Microsoft Windows | Microsoft Corporation |
| .XDSL | D-Link Corporation | Arquivos de sistema | D-link Router UK Firmware Update File | Unknown Software | Unknown Developer |
| .XFB | Apple | Arquivos de sistema | Xserve RAID Firmware Binary File | Apple Xserve RAID Admin | Apple |
| .XGT | Debian | Arquivos de sistema | Debian Template File | Debian | Debian |
| .XMO | Adobe Systems Incorporated | Arquivos de sistema | Adobe Authorware Movie Driver | Adobe Authorware | Adobe Systems Incorporated |
| .XMS | Alexander Gross | Arquivos de sistema | Music Studio Project | Alexander Gross Music Studio | Alexander Gross |
| .XRM-MS | Microsoft Corporation | Arquivos de sistema | Microsoft Security Certificate | Microsoft Windows | Microsoft Corporation |
| .XXT | Microsoft Corporation | Arquivos de sistema | Dynamic Link Library | Microsoft Visual FoxPro | Microsoft Corporation |
| .ZC | Eric Isaacson Software | Arquivos de sistema | Zipkey Configuration | Zipkey | Eric Isaacson Software |
| .ZEX | Zoom Corporation | Arquivos de sistema | ZOOM MRS-802 System File | MRS-802 | Zoom Corporation |
| .ZONE.IDENTIFIER | Microsoft Corporation | Arquivos de sistema | Microsoft Windows Zone Identifier File | Microsoft Windows | Microsoft Corporation |
| .ZUP | Microsoft Corporation | Arquivos de sistema | Microsoft Business Solutions Navision Configuration | Microsoft Dynamics NAV (Navision) | Microsoft Corporation |
| .~CU | Unknown Developer | Arquivos de sistema | Windows Cursor File | ACD Systems ACDSee | ACD Systems |
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