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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .W61 | Corel Corporation | Text Files | Corel WordPerfect 6.1 Document | Corel WordPerfect | Corel |
| .WBK | Microsoft Corporation | Text Files | Word Document Backup | Microsoft Word | Microsoft Corporation |
| .WCD | Microsoft Corporation | Text Files | Microsoft Works Calendar File | Microsoft Works | Microsoft Corporation |
| .WCN | Anthemion Software Ltd. | Text Files | Writer's Café Notebook Data | Writer's Café | Anthemion Software Ltd. |
| .WCP | Corel | Text Files | WinDVD Creator Project File | Corel WinDVD | Corel |
| .WD2 | Rockstar Games | Text Files | American Idol Data | American Idol | Rockstar Games |
| .WIS | Flexera Software | Text Files | InstallShield Install Help File | InstallShield | Flexera Software |
| .WKB | Corel | Text Files | Corel WordPerfect Document | Corel WordPerfect | Corel |
| .WKF | KeyFocus | Text Files | KF Web Server Default Control File | KF Web Server | KeyFocus |
| .WN | WN | Text Files | WN Web File | WN | Open Source |
| .WOL | Don Johnston, Inc. | Text Files | Write:OutLoud File | Write: OutLoud | Don Johnston, Inc. |
| .WP | Corel | Text Files | WordPerfect Document | Corel WordPerfect X8 | Corel |
| .WP4 | Corel | Text Files | WordPerfect 4 Document | Corel WordPerfect X8 | Corel |
| .WP5 | Corel | Text Files | WordPerfect 5 Document | Corel WordPerfect X8 | Corel |
| .WP6 | Corel | Text Files | WordPerfect 6 Document | Corel WordPerfect X8 | Corel |
| .WPA | Swiftpage, Inc. | Text Files | ACT Word Processing Document | Swiftpage Act | Swiftpage, Inc. |
| .WPD | Corel | Text Files | WordPerfect Document | Corel WordPerfect X8 | Corel |
| .WPH | Phoenix Technologies | Text Files | Phoenix BIOS File | Phlash16.exe | Phoenix Technologies |
| .WPL | Microsoft Corporation | Text Files | Windows Media Player Playlist | Microsoft Windows Media Player | Microsoft Corporation |
| .WPS | Kingsoft | Text Files | Kingsoft Writer Document | WPS Office | Kingsoft |
| .WPT | Corel | Text Files | WordPerfect Template | Corel WordPerfect X8 | Corel |
| .WPW | PC SOFT | Text Files | WinDev Mobile Window File | WinDev | PC SOFT |
| .WRD | Open Source | Text Files | COREX Manually Verified Word Segmentation Data | COREX | Open Source |
| .WRF | Cisco Systems | Text Files | WebEx Recording | Cisco WebEx Player | Cisco Systems |
| .WRI | Microsoft Corporation | Text Files | Microsoft Write Document | LibreOffice | The Document Foundation |
| .WRT | IBM | Text Files | IBM Writing Assistant Document | MS-DOS | Microsoft Corporation |
| .WS | MicroPro International Corp. | Text Files | WordStar Document | Corel WordPerfect X8 | Corel |
| .WS2 | MicroPro International Corp. | Text Files | WordStar Document | Corel WordPerfect X8 | Corel |
| .WSA | Sonicle | Text Files | WebSynth Media File | WebSynth | Sonicle |
| .WSD | MicroPro International Corp. | Text Files | WordStar Document | Corel WordPerfect X8 | Corel |
| .WSR | Genius Media Group | Text Files | Crossword Genius Data | Crossword Genius | Genius Media Group |
| .WT2 | MicroVision Development, Inc. | Text Files | WordExpress Document Template | WordExpress | MicroVision Development, Inc. |
| .WTT | HamsterCoders | Text Files | Write! Document | Write! | HamsterCoders |
| .WTX | Stefan Hagel | Text Files | Text Document | Microsoft Notepad | Microsoft Corporation |
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