| wlua | SciTE WLUA Data |
| wlx | WinList Analysis Protocol File |
| wm | Working Model 2D Model |
| wm2 | Working Model 2D Model |
| wm3 | MSC.visualNastran 4D Model |
| wmg | SecureDoc Encrypted Hard Drive Control File |
| wmi | WorlMate Itinerary Data |
| wms | Web Map Service Data |
| wmts | Web Map Tile Service Data |
| wmu | WIND Tunnel WIND Data |
| wn | WN Web Server Data |
| wnd | FARSITE Wind Data |
| wni | Generations Family Tree Data |
| wni | Wisco RC21 Virtual Com Port Settings |
| wnk | Wink Presentation |
| wnu | WIND Tunnel UMTS Measurement Data |
| wock | Route 66 for Mac Data |
| wof | Aveva MDS Witch Hanger Data |
| wog | WAsP Obstacle Group |
| wop | Wonderland Adventures Editor Object |
| wordlist | Desktop Poet Word List |
| work | Bibble Work Queue |
| wot | Web of Trust Data |
| wot | WebEx Recording File |
| wov | Cakewalk Sonar Picture Cache |
| wox | MapInfo Professional Additional Workspace Data |
| wpa | WorkPlace Pro Utilities Alarm Page Builder Data |
| wpb | WorkPlace Pro Utilities Backup and Transport Data |
| wpc | WorkPlace Pro Utilities Data Collector Data |
| wpd | WorkPlace Pro Utilities Container Duplicator Data |
| wph | WorkPlace Pro Utilities Batch |
| wpi | OS/2 WarpIN Installer |
| wpj | WorkPlace Pro Utilities Jar File Maps Data |
| wpk | Corel WordPerfect Keyboard Layout |
| wpn | Schedule24 Schedule Data |