| 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 |
| xmss | FileMaker Pro XML Script |
| xmwx | ExamSoft SofTest Working Data |
| xnk | Microsoft Exchange Public Folder Shortcut |
| xpt | Mozilla Firefox XPCOM Type Library |
| xrnx | Renoise Tool |
| xrs | Real Player External Resource |
| xslic | XenServer License Data |
| xtea | XTEA Encyrpted Data |
| xtn | OSLib Program |
