| 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 |
| wp1 | MODAWEC Output 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 |
| wpo | Holux GM-101 Waypoint |
| wpp | WebPlus Site Data |
| wpp | WorkPlace Pro Utilities Property Sets Export Data |
| wpq | WorkPlace Pro Utilities Station Query |
| wpr | WorkPlace Pro Utilities Report Generator Data |
| wpr | Holux GM-101 Route |
| wprp | Windows Performance Recorder Recording Profile |
| wps | WorkPlace Pro Utilities Property Sheets Data |
| wpt | WorkPlace Pro Utilities Tree Builder Data |
| wpv | WorkPlace Pro Utilities Value Table Builder Data |
| wpx | WebPlus Site Template |
| wq | SOBEK Water Quality Locations Data |
| wqc | Wondershare QuizCreator Data |
| wqi | ALEID2000 Water Quality Information Data |
| wqs | WebQuest Surfer Data |
| wr | STK Write Ups File |
| wrapper | Gnome Desktop Wrapper Data |
| wrf | WebEx Recording File |