| 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 |
| wimp | Microsoft Windows Icon Palette |
| win | Opera Saved Session |
| win32 | GetDiz Data |
| windowslivecontact | Windows Live Contacts |
| wings | Wings 3D Mesh |
| winmerge | WinMerge Data |
| wipeinfo | Norton Utilities SendTo Data |
| wir | Mentor Expedition PCB Tool Data |
| wis | InstallShield Help Data |
| witsml | Wellsite Information Transfer Standard Markup Language Data |
| wizard | StormWIZARD Resource Data |
| wjf | WinZip Job File |
| wjr | ReGet Junior Data |
| wkd | WiKID Token Data |
| wkf | VISI CAD Work Data |
| wkg | AutoDesk Softimage Workgroup Data |
| wkl | WaKan Word List Data |
| wko | RippedPro Workout Data |
| wko | TrainingPeaks WKO+ Data |
| wkp | Web CEO Database Backup |
| wksp | Workspace Macro Pro Data |
| wky | WinKeySim MFC Application Data |
