File extensions start with character 'W'
| File Type | Category | File Format | |
|---|---|---|---|
| .w01 | Yamaha Files | Yamaha SY Series Wave File | |
| .w02 | Audio Files | Split Archive File | |
| .w3x | Game Files | Warcraft 3 Expansion Map FIle | |
| .wab | Data Files | Windows Address Book | |
| .wad | Game Files | Doom WAD File | |
| .war | Java Archive Files | Java Web Archive | |
| .wav | Audio Files | WAVE Audio File | |
| .wb1 | Raster Graphics Files | Webshots Picture File | |
| .wbcat | Backup Files | Windows Backup Catalog File | |
| .wbk | Backup Files | Word Document Backup | |
| .wcat | Data Files | WinCatalog Collection File | |
| .wcd | Data Files | Works Calendar File | |
| .wcf | Data Files | WebEx Saved Chat Session | |
| .wcz | Configuration Files | Chameleon Clock Wallpaper File | |
| .wdf | Data Files | Workshare Compare DeltaFile | |
| .wdq | Data Files | Offline Explorer Queue File | |
| .wdseml | Multiple Use Files | Thunderbird Searchable Email File | |
| .wea | Data Files | Ecotect Weather File | |
| .webarchivexml | Android Files | Android Web Browser Archive | |
| .webm | Digital Video Files | WebM Video File | |
| .wer | Microsoft Files | Windows Error Report | |
| .wfm | Data Files | Tektronix Waveform Data File | |
| .wft | Export Files | GTA 4 Car Model File | |
| .wgt | Web Files | Opera Widget File | |
| .wid | Data Files | SAP BusinessObjects Web Intelligence File | |
| .wim | Windows Files | Windows Imaging Format File | |
| .winclone | Disk Image Files | Winclone Image | |
| .windowsli | Data Files | Windows Live Contacts File | |
| .wiz | Program Execution Files | Microsoft Wizard File | |
| .wjr | Data Files | ReGet Deluxe Data File | |
| .wk1 | Data Files | Lotus Worksheet | |
| .wk2 | Data Files | Lotus 2 Worksheet | |
| .wk3 | Lotus Files | Lotus 3 Worksheet | |
| .wk4 | Data Files | Lotus 4 Worksheet | |
| .wk5 | Data Files | Lotus 5 Worksheet | |
| .wke | Data Files | Lotus 1-2-3 Educational Version Worksheet | |
| .wlmp | Digital Video Files | Windows Live Movie Maker Project File | |
| .wma | Windows Media Files | Windows Media Audio File | |
| .wmf | Vector Graphics Files | Windows Metafile | |
| .wmv | Digital Video Files | Windows Media Video File | |
| .wnk | Data Files | Wink Presentation | |
| .wotreplay | Game Files | World of Tanks Replay File | |
| .wp | Text Files | WordPerfect Document | |
| .wp4 | Text Files | WordPerfect 4 Document | |
| .wp5 | Text Files | WordPerfect 5 Document | |
| .wp5 | Document Files | WordPerfect 5 file | |
| .wp6 | Text Files | WordPerfect 6 Document | |
| .wp7 | Text Files | WordPerfect 7 Document | |
| .wpa | Text Files | ACT! Word Processing Document | |
| .wpc | Data Files | WordPad Converter File | |
| .wpd | Text Files | WordPerfect Document | |
| .wpf | Data Files | WordPerfect Form | |
| .wpg | Vector Graphics Files | WordPerfect Graphic File | |
| .wpk | Audio Files | Nero Wave Editor File | |
| .wpl | Digital Video Files | Windows Media Player Playlist | |
| .wpm | Executable Files | WordPerfect Macro File | |
| .wpo | Data Files | HOLUX Waypoint File | |
| .wpp | Wordperfect Files | WebPlus Project File | |
| .wps | Microsoft Office Files | Microsoft Works Word Processor Document | |
| .wpt | Text Files | WordPerfect Template | |
| .wpw | Development Files | WinDev Mobile Window File | |
| .wq1 | Spreadsheet Files | Quattro Pro for DOS Spreadsheet File | |
| .wri | Text Files | Windows Write Document | |
| .wrpl | Game Files | Widelands Saved Game File | |
| .wsd | Text Files | WordStar Document | |
| .wsdl | Microsoft Files | Web Services Description Language File | |
| .wsi | Data Files | Wise Package Studio Installer Package | |
| .wsm | Data Files | Wise Package Studio Merge Module | |
| .wtb | Data Files | Win-Test Binary Log File | |
| .wtf | Configuration Files | World of Warcraft Text File | |
| .wtr | Data Files | Encarta File | |
| .wtx | Text Files | Text Document | |
| .wz | Game Files | MapleStory Game Data File |