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