| .W | Progress Software Corporation | Ficheiros de Desenvolvedor | OpenEdge Architect Source Code File | OpenEdge | Progress Software Corporation |
| .W3 | APL2000 | Ficheiros de Desenvolvedor | APL+Win Workspace File | APL+Win | APL2000 |
| .W32 | Microsoft Corporation | Ficheiros de Desenvolvedor | Win32 Makefile | GNU Make | GNU Operating System |
| .WAM | Team17 | Ficheiros de Desenvolvedor | Worms Armageddon Mission File | Worms Armageddon | Team17 |
| .WAS | Symantec Corporation | Ficheiros de Desenvolvedor | Symantec Procomm Plus Script | Procomm Plus | Symantec Corporation |
| .WBF | Microsoft Corporation | Ficheiros de Desenvolvedor | Microsoft Windows Batch File | Microsoft Notepad | Microsoft Corporation |
| .WDG | PC SOFT | Ficheiros de Desenvolvedor | WinDev Procedures | WinDev | PC SOFT |
| .WDGT | Opera Software | Ficheiros de Desenvolvedor | Opera Widget File | Opera | Opera Software |
| .WDL | Conitec | Ficheiros de Desenvolvedor | World Definition Language Script | 3D GameStudio | Conitec |
| .WDO | PC SOFT | Ficheiros de Desenvolvedor | WinDev Component List | WinDev | PC SOFT |
| .WDP | Microsoft Corporation | Ficheiros de Desenvolvedor | Windows Media Photo File | Adobe Photoshop | Adobe Systems Incorporated |
| .WDW | PC SOFT | Ficheiros de Desenvolvedor | WinDev Window File | WinDev | PC SOFT |
| .WFS | Microsoft Corporation | Ficheiros de Desenvolvedor | Microsoft Windows Installation Script | Microsoft Windows | Microsoft Corporation |
| .WHS | X-Ways | Ficheiros de Desenvolvedor | WinHex Script | WinHex | X-Ways |
| .WID | SAP | Ficheiros de Desenvolvedor | SAP BusinessObjects Web Intelligence File | SAP BusinessObjects Business Intelligence | SAP |
| .WOD | Apple | Ficheiros de Desenvolvedor | WebObjects Declaration File | WebObjects | Apple |
| .WORKSHEET | Bare Bones Software | Ficheiros de Desenvolvedor | BBEdit Shell Worksheet File | BBEdit | Bare Bones Software |
| .WOWPROJ | Open Source | Ficheiros de Desenvolvedor | AddOn Studio Project File | Addon Studio for World of Warcraft | Open Source |
| .WPW | PC SOFT | Ficheiros de Desenvolvedor | WinDev Mobile Window File | WinDev | PC SOFT |
| .WSC | Open Source | Ficheiros de Desenvolvedor | WonderSwan Color Game ROM | Oswan | Open Source |
| .WSP | Microsoft Corporation | Ficheiros de Desenvolvedor | SharePoint Solution Package | Microsoft Visual Studio | Microsoft Corporation |
| .WXS | Outercurve Foundation | Ficheiros de Desenvolvedor | WiX Source File | WiX Toolset | .NET Foundation |
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