| whtt | HTTrack Website Copier Data |
| whx | WinHex Backup Data |
| wid | Microsoft Sharepoint Document Set Index |
| wid | Corel Ventura 4 Width Table |
| wie | WordPress Widget Exporter Data |
| wiff | AB SCIEX Windows Interchange File Format Data |
| wig | Wiggle Genome Track Data |
| wild | HyperCard WILD Data |
| win | Opera Saved Session |
| win32 | GetDiz Data |
| windowslivecontact | Windows Live Contacts |
| wings | Wings 3D Mesh |
| wir | Mentor Expedition PCB Tool Data |
| wis | InstallShield Help Data |
| wjf | WinZip Job File |
| wjr | ReGet Junior Data |
| wkd | WiKID Token Data |
| wke | Lotus 1-2-3 Educational Version Worksheet |
| wkg | AutoDesk Softimage Workgroup Data |
| wkl | WaKan Word List Data |
| wko | RippedPro Workout Data |
| wko | TrainingPeaks WKO+ Data |
| wkp | Web CEO Database Backup |
| wl | WISCO Word Power Word List |
| wl | Wanderlust Configuration |
| wlb | WinList Bundle File |
| wlf | Argo WebLoad Upload File |
| wlk | WeatherLink Binary Weather Data |
| wlt | eWallet Wallet |
| wltg | eWallet GO! Data |
