| wdx | Total Commander Content Plugin |
| webloc | Macintosh URL Shortcut |
| website | Internet Explorer Pinned Site Shortcut |
| wer | Windows Error Report |
| wflow | Automator Workflow |
| wfx | Total Commander File System Plugin |
| 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 |
| wordlist | Desktop Poet Word List |
| workflow | Automator Workflow |
| wpe | WordPerfect Entrust Document |
| wsp | Adobe ImageReady Application Workspace |
| wta | Wintune Library |
| wtc | Logitech Webcam Watch File |
| wwd | Microsoft Works Wizard |
| wwd | Works Wizard |
| wxm | wxMaxima Batch File |
| wxn | Waixing NES ROM Image |
| wzmul | WinZip Registration |
| xe | XMOS Executable |
| xensearch | XenCenter Saved Search |
| 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 |
