| wl | WISCO Word Power Word List |
| wl | Wanderlust Configuration |
| wlb | WinList Bundle File |
| wldprp | SolidWorks Weldment Custom Property Template |
| wlf | Argo WebLoad Upload File |
| wlg | Well Logger v1 Data |
| wlic | WIC SDK License Data |
| wlk | WeatherLink Binary Weather Data |
| wlt | eWallet Wallet |
| wltg | eWallet GO! Data |
| 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 | SOBEK Wind Data |
| wnd | FARSITE Wind Data |
| wne | WIDI Note Editor 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 | WebEx Recording File |