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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .W31 | Microsoft Corporation | System Files | Windows 3.1 Startup Data | Microsoft Windows 3.x | Microsoft Corporation |
| .WCF | Microsoft Corporation | System Files | WebEx Saved Chat Session | Microsoft Notepad | Microsoft Corporation |
| .WDF | Workshare | System Files | Workshare Compare DeltaFile | Workshare Compare | Workshare |
| .WDGT | Opera Software | System Files | Opera Widget File | Opera | Opera Software |
| .WDPROJ | Microsoft Corporation | System Files | Microsoft Visual Studio Web Deployment Project File | Microsoft Visual Studio | Microsoft Corporation |
| .WDR | Psion PLC | System Files | Psion Series 3 Printer Driver | Symbian OS | Nokia |
| .WEBPNP | Microsoft Corporation | System Files | Web Point And Print File | Microsoft Windows | Microsoft Corporation |
| .WGZ | Nokia | System Files | S60 Web Runtime Widget Package | Nokia PC Suite | Nokia |
| .WPH | Phoenix Technologies | System Files | Phoenix BIOS File | Phlash16.exe | Phoenix Technologies |
| .WPX | Microsoft Corporation | System Files | Printer Description File 2 | Microsoft Windows | Microsoft Corporation |
| .WRS | Corel Corporation | System Files | Corel WordPerfect Windows Printer Driver File | Corel WordPerfect X8 | Corel |
| .WSS | Microsoft Corporation | System Files | Microsoft Windows Sound System File | Microsoft Windows | Microsoft Corporation |
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