| wfx | Total Commander File System Plugin |
| wh | Unionfs Whited Out File |
| wht | Microsoft NetMeeting Whiteboard |
| wlms | Windows Live Movie Maker Script |
| wlmx | Windows Live Movie Maker Effect |
| wlpk | Renault R-Link Update Package |
| wlx | Total Commander Lister Plugin |
| workflow | Automator Workflow |
| wpe | WordPerfect Entrust Document |
| wrypt | PanWrypter Depleted Storage Volume |
| wsp | Adobe ImageReady Application Workspace |
| wsrmac | Windows Speech Recognition Macro |
| wssx | Microsoft Windows Server Add-in |
| wt6 | 602PC Suite Plugin |
| wta | Wintune Library |
| wtc | Logitech Webcam Watch File |
| wxm | wxMaxima Batch File |
| wxml | WeChat Mini Program |
| wxn | Waixing NES ROM Image |
| xcon | Conceal Encrypted Data |
| xe | XMOS Executable |
| xeo | Signwave Auto-Illustrator Extension |
| xfm | Adobe Audition XFM Plug-in |
| xia | Chiasmus Encrypted File |
| xis | Chiasmus Key File |
| xl3 | Vegaelec XL3 System Data |
| xlnk | XML Link |
| xlsenx | Egis Encrypted Data |
| xlx | XoloX File |
| xmsc | FileMaker Pro XML Export Script |