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