| wwx | winIDEA Watch XML Format Data |
| wxp | wxWidgets Package Description Data |
| wxs | WeChat Script |
| wxss | WeChat StyleSheets Data |
| wxw | Winradio Extended Wave Data |
| wxx | Worldographer Map Settings Data |
| wyc | wyBuild Version Data |
| wyc | wyUpdate Compressed Client Data |
| wys | wyBuild Server Data |
| wyu | wyBuild Update Data |
| wzcloud | WinZip Cloud Data |
| wzct | AbleCommerce Wizard Configuration Backup |
| wzd | Sharp Wizard Data |
| wzf | AbleCommerce Wizard Form Data |
| wzi | AbleCommerce Wizard Index Data |
| wzmul | WinZip Registration Data |
| wzo | AbleCommerce Wizard Output Data |
| wzsul | WinZip Multi-user Registration Data |
| wztheme | WinZip Theme Data |
| x00 | Paradox Secondary Index |
| x00 | XTreeGold for Dos Help Data |
| x01 | Paradox Secondary Index |
| x02 | Paradox Secondary Index |
| x03 | Paradox Secondary Index |
| x04 | Paradox Secondary Index |
| x05 | Paradox Secondary Index |
| x06 | Paradox Secondary Index |
| x07 | Paradox Secondary Index |
| x08 | Paradox Secondary Index |
| x09 | Paradox Secondary Index |
| x1 | X1 Saved Search |
| x10 | XTreeGold for Dos Help Data |
| x12 | EDI X12 Data |
| x1d | Vicon Nexus Unprocessed Data |
| x1s | X1 Search Saved Search |
