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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .WA | Open Source | Compressed Files | Windows Addon Archive | Win Toolkit | Open Source |
| .WA2 | Midnight Synergy | Game Files | Wonderland Adventures Custom Adventure File | Subspace Continuum | Open Source |
| .WAV | Microsoft Corporation | Audio Files | WAVE Audio File | ModPlug Player | Open Source |
| .WB | Electronic Arts | Game Files | FIFA 2000 Game Data | Freelang | Open Source |
| .WB2 | Threefold Photos, Inc. | Raster Image Files | Webshots Picture File | Ultimate Webshots Converter | Open Source |
| .WBC | Threefold Photos, Inc. | Raster Image Files | Webshots Collection File | Ultimate Webshots Converter | Open Source |
| .WBD | Threefold Photos, Inc. | Raster Image Files | Webshots Picture File | Ultimate Webshots Converter | Open Source |
| .WBF | Microsoft Corporation | Developer Files | Microsoft Windows Batch File | PSPad | Open Source |
| .WBZ | Threefold Photos, Inc. | Raster Image Files | Webshots Download Picture File | Ultimate Webshots Converter | Open Source |
| .WCR | Open Source | Settings Files | Ergane Configuration File | Ergane | Open Source |
| .WDF | Workshare | Data Files | Workshare Compare DeltaFile | WiiJManager | Open Source |
| .WEAP | id Software | Game Files | Quake 3 Engine Weapon File | AbiWord | Open Source |
| .WEBARCHIVE | Apple | Web Files | Safari Web Archive | WebArchive Extractor | Open Source |
| .WEBM | Video Files | WebM Video File | Eltima Elmedia Player | Open Source | |
| .WEBP | Raster Image Files | Google Image File Format | IrfanView | Open Source | |
| .WGM | Open Source | Game Files | Chalk Game Data | Chalk | Open Source |
| .WGT | Interscape | Data Files | IMPS Data File | Xwindow Neuro Bio Clusters | Open Source |
| .WHTT | Open Source | Web Files | HTTrack Website Copier File | HTTrack | Open Source |
| .WI | Open Source | Raster Image Files | Wavelet Image | DjVu Reader | Open Source |
| .WIM | Microsoft Corporation | Disk Image Files | Windows Imaging Format File | ExtractNow | Open Source |
| .WINGS | Open Source | 3D Image Files | Wings 3D File | Wings 3D | Open Source |
| .WK! | IBM | Spreadsheet Files | Lotus 1-2-3 Spreadsheet | Gnumeric | Open Source |
| .WK1 | IBM | Data Files | Lotus Worksheet | Gnumeric | Open Source |
| .WK4 | IBM | Data Files | Lotus Lotus 1-2-3 V4 Worksheet | Gnumeric | Open Source |
| .WKB | Corel | Text Files | Corel WordPerfect Document | PostGIS | Open Source |
| .WMA | Microsoft Corporation | Audio Files | Windows Media Audio File | Eltima Elmedia Player | Open Source |
| .WML | Syncro Soft | Web Files | Wireless Markup Language File | AbiWord | Open Source |
| .WMV | Microsoft Corporation | Video Files | Windows Media Video File | Eltima Elmedia Player | Open Source |
| .WN | WN | Web Files | WN Web File | WN | Open Source |
| .WOFF | Open Source | Font Files | Web Open Font Format File | FontForge | Open Source |
| .WOW | Open Source | Audio Files | Grave Composer Music Module | OpenMPT | Open Source |
| .WOWPROJ | Open Source | Developer Files | AddOn Studio Project File | Addon Studio for World of Warcraft | Open Source |
| .WPB | PGN Inc. | Raster Image Files | OpenCanvas 1.1 Image | Windows Phone Device Manager | Open Source |
| .WPJ | Watcom International Corporation | Uncommon Files | Watcom C/C++ Project | Watcom C/C++ | Open Source |
| .WPT | Corel | Text Files | WordPerfect Template | Cube 2 Sauerbraten | Open Source |
| .WR! | IBM | Spreadsheet Files | Lotus 1-2-3 Spreadsheet | Gnumeric | Open Source |
| .WRD | Open Source | Text Files | COREX Manually Verified Word Segmentation Data | COREX | Open Source |
| .WRL | Unknown Developer | 3D Image Files | VRML World | FreeWRL | Open Source |
| .WRZ | Parallel Graphics | 3D Image Files | Compressed VRML World File | FreeWRL | Open Source |
| .WS | MicroPro International Corp. | Text Files | WordStar Document | OpenEmu | Open Source |
| .WSC | Open Source | Game Files | WonderSwan Color Game ROM | Oswan | Open Source |
| .WSIM | Open Source | Web Files | FirstStop WebSearch Import Module | FirstStop WebSearch | Open Source |
| .WSR | Genius Media Group | Data Files | Crossword Genius Data | FirstStop WebSearch | Open Source |
| .WUL | Open Source | Uncommon Files | WinUHA Language File | WinUHA | Open Source |
| .WV | David Bryant | Audio Files | WavPack Audio File | XMMS | Open Source |
| .WVC | Open Source | Audio Files | WavPack Correction File | WavPack | Open Source |
| .WVE | Wondershare Software Co., Ltd. | Video Files | Wondershare Filmora Project File | SoX | Open Source |
| .WVL | Open Source | Raster Image Files | Wavelet Image | DjVu Reader | Open Source |
| .WVM | Video Files | Google Play Video File | HandBrake | Open Source | |
| .WX | Open Source | Backup Files | Wanam Xposed Backup File | Wanam Xposed | Open Source |
| .WXM | Open Source | Uncommon Files | wxMaxima Batch File | wxMaxima | Open Source |
| .WXP | Open Source | Video Files | Wax 2.0 Project | DebugMode Wax | Open Source |
| .WXR | Open Source | Data Files | WxWindgets Resource Data | wxWidgets | Open Source |
| .WZ | Nexon | Game Files | MapleStory Game Data File | Warzone 2100 | Open Source |
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