| wixproj | WiX Toolset Project File |
| wkf | KF Webserver Script |
| wli | WL Intermediate Data |
| wlmi | WLM Intermediate Data |
| wln | Novell Localisation Workbench Workspace |
| wlog | WinDev Runtime Log |
| wmb | 3D Gamestudio Compiled Map |
| wmk | WebMake Documentation Source Code |
| wmls | WMLScript File |
| wmlsc | Compiled WMLScript |
| wo | WebObjects Object |
| woa | WebObjects Application |
| wod | WebObjects Declaration |
| woo | WebObjects Object |
| workspace | Code::Blocks Workspace |
| wpss | IBM WebSphere Portal Server Settings Data |
| wrn | Eclipse WRN Data |
| wrx | Progress OpenEdge ActiveX Properties |
| wscript | Waf Wscript |
| wsct | WinDev Test Scenario |
| wsdd | Axis Web Service Deployment Descriptor |
| wse | Wise Package Studio Script |
| wsi | Wise Package Studio Installer Package |
| wsil | Web Services Inspection Language Data |
| wsm | Wise Package Studio Merge Module |
| wsrc | WAIS Source File |
| wssp | CommuniGate Pro Web Server-Side Programming Data |
| wte | WinDev Report Template |
| wwn | WebDev Browser Procedures |
| wwt | WebDev Page Template |
| wxf | WinSQL Scheduled Task Script |
| wxi | WiX Include File |
| wxl | WiX Localization File |
| wxr | wxWidgets Resource Data |
| wxres | WinDev Automatic Test Results |