| wdr | AutoCAD Electrical Project Ratings Data |
| wdseml | Thunderbird Searchable Email File |
| wdsp | WebDrive Data |
| wdt | AutoCAD Electrical Project Titles Data |
| wdv | TracePlus Web Detective Data |
| wdw | AutoCAD Electrical Project Wires Data |
| wdx9 | Microsoft Word for Mac Wizard Data |
| wea | Autodesk Ecotect Analysis Weather Data |
| webarchive | Safari Web Archive |
| webbookmark | Safari Web Bookmark Data |
| webex | WebEx Recording File |
| webhistory | Safari Web History Data |
| webinar | GoToWebinar Session Data |
| weboogl | WebOOGL Data |
| webpart | Microsoft Sharepoint Web Part |
| webtest | Fiddler Saved WebTest Data |
| webx | Akamix Saved Search Data |
| weg | PTV VISSIM Path Data |
| weights | SAM Sequence Weights Data |
| wel | Heliosoft Seismaster Input Well Path |
| wel | MODFLOW Well Package |
| wells | ParFlow Well Output Data |
| wenlin | Wenlin Software Data |
| wenlinbin | Wenlin Software Binary Data |
| wenlindb | Wenlin Software Database |
| wenlinfc | Wenlin Software Flashcards Data |
| wenlinfx | Wenlin Software FX Data |
| wes | WE7000 Control Software Setup Data |
| wex | WexView Browser Course Data |
| wf4 | PTC Creo Parametric Symbol Data |