| wdo | WinDev Component List |
| wdt | WinDev Template File |
| wdw | WinDev Window File |
| wdy | WinDev Run-Time Template |
| webinfo | Visual Studio .NET Web Information Data |
| webtemplate | iWeb Template |
| webtheme | iWeb Theme Template |
| wet | WinSQL Export Template |
| wew | Debugging Tools for Windows Saved Workspace |
| wfo | Delphi Runimage File |
| wfs | Windows Script File |
| whl | Python Wheel Package |
| whs | WinHex Script |
| widget | HybridJava Widget |
| wiki | Wikitext Source Code |
| win | Visual FoxPro Window File |
| winmd | Microsoft Windows Metadata |
| winsqlscript | WinSQL Script |
| wiq | Visual Studio Work Item Query |
| wis | Rocket wIntegrate Script |
| wixlib | WiX Library File |
| wixmsp | WiX XML Patch File |
| wixmst | WiX Transform File |
| wixobj | WiX Object File |
| wixout | WiX XML Output File |
| wixpdb | WiX Debug File |
| 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 |