| .W | Progress Software Corporation | Arquivos de jogos | OpenEdge Architect Source Code File | OpenEdge | Progress Software Corporation |
| .W3G | Blizzard Entertainment Inc. | Arquivos de jogos | Warcraft 3 Replay File | Warcraft III | Blizzard Entertainment Inc. |
| .W3M | Blizzard Entertainment Inc. | Arquivos de jogos | Warcraft 3 Map File | Blizzard Warcraft 3 | Blizzard Entertainment Inc. |
| .W3N | Blizzard Entertainment Inc. | Arquivos de jogos | Warcraft 3 Expansion Campaign Map File | Warcraft III | Blizzard Entertainment Inc. |
| .W3P | Blizzard Entertainment Inc. | Arquivos de jogos | Warcraft 3 Progress File | Warcraft III | Blizzard Entertainment Inc. |
| .W3U | Blizzard Entertainment Inc. | Arquivos de jogos | Warcraft 3 Custom Units Data | Warcraft III | Blizzard Entertainment Inc. |
| .W3V | Blizzard Entertainment Inc. | Arquivos de jogos | Warcraft 3 Campaign Progress Record | Warcraft III | Blizzard Entertainment Inc. |
| .W3X | Blizzard Entertainment Inc. | Arquivos de jogos | Warcraft 3 Expansion Map FIle | Warcraft III | Blizzard Entertainment Inc. |
| .W3Z | Blizzard Entertainment Inc. | Arquivos de jogos | Warcraft 3 Saved Game File | Blizzard Warcraft 3 | Blizzard Entertainment Inc. |
| .WA2 | Midnight Synergy | Arquivos de jogos | Wonderland Adventures Custom Adventure File | Wonderland Adventures | Midnight Synergy |
| .WAD | id Software | Arquivos de jogos | Doom WAD File | Doom | id Software |
| .WAG | Kuju Entertainment | Arquivos de jogos | Train Simulator Wagon File | Microsoft Train Simulator | Kuju Entertainment |
| .WAGAME | Team17 | Arquivos de jogos | Worms Armageddon Game Recording | Worms Armageddon | Team17 |
| .WAL | Nullsoft | Arquivos de jogos | Winamp Modern Skin | Nullsoft Winamp | Nullsoft |
| .WAM | Team17 | Arquivos de jogos | Worms Armageddon Mission File | Worms Armageddon | Team17 |
| .WB | Electronic Arts | Arquivos de jogos | FIFA 2000 Game Data | FIFA 2000 | Electronic Arts |
| .WBT | Nabi Studios | Arquivos de jogos | Toribash Help File | Toribash | Nabi Studios |
| .WCFG | WildTangent | Arquivos de jogos | WildTangent Configuration | WildTangent Games App | WildTangent |
| .WD2 | Rockstar Games | Arquivos de jogos | American Idol Data | American Idol | Rockstar Games |
| .WDB | Microsoft Corporation | Arquivos de jogos | Microsoft Works Database | LibreOffice | The Document Foundation |
| .WDF | Workshare | Arquivos de jogos | Workshare Compare DeltaFile | Workshare Compare | Workshare |
| .WDR | Psion PLC | Arquivos de jogos | Psion Series 3 Printer Driver | Symbian OS | Nokia |
| .WEAP | id Software | Arquivos de jogos | Quake 3 Engine Weapon File | Microsoft Notepad | Microsoft Corporation |
| .WF | Electronic Arts | Arquivos de jogos | FIFA 2000 Game Data | FIFA 2000 | Electronic Arts |
| .WFE | PC SOFT | Arquivos de jogos | Crossword Express Word Find Puzzle | Crossword Express | PC SOFT |
| .WFT | Rockstar Games | Arquivos de jogos | GTA 4 Car Model File | Zanoza ZModeler | Zanoza Software |
| .WG | Electronic Arts | Arquivos de jogos | FIFA 2000 Game Data | FIFA 2000 | Electronic Arts |
| .WGAMEPROFILE | Activision | Arquivos de jogos | X-Men Origins: Wolverine Profile | X-Men Origin: Wolverine | Activision |
| .WGF | Widelands Development Team | Arquivos de jogos | Widelands Game File | Widelands | Widelands Development Team |
| .WGL | Accolade, Inc. | Arquivos de jogos | The Games: Winter Challenge Tournament File | Winter Challenge | Accolade, Inc. |
| .WGM | Open Source | Arquivos de jogos | Chalk Game Data | Chalk | Open Source |
| .WGPKG | Wargaming Group Limited | Arquivos de jogos | WarGaming Update Package | World of Tanks | Wargaming Group Limited |
| .WHM | Relic Entertainment | Arquivos de jogos | Warhammer 40,000: Dawn Of War Model File | Warhammer 40K Dawn of War | Relic Entertainment |
| .WI | Open Source | Arquivos de jogos | Wavelet Image | Corel Presentations X8 | Corel |
| .WJ | EA Maxis | Arquivos de jogos | FIFA 2000 Game File | FIFA 2000 | Electronic Arts |
| .WL1 | id Software | Arquivos de jogos | Wolfenstein 3D Data File | Wolfenstein 3D | id Software |
| .WL3 | id Software | Arquivos de jogos | Wolfenstein 3D Registered Version File | Wolfenstein 3D | id Software |
| .WL6 | id Software | Arquivos de jogos | Wolfenstein 3D Data File | Wolfenstein 3D | id Software |
| .WLL | Electronic Arts | Arquivos de jogos | The Sims Wall Texture File Format | The Sims | Electronic Arts |
| .WMF | Microsoft Corporation | Arquivos de jogos | Windows Metafile | Adobe Illustrator CC | Adobe Systems Incorporated |
| .WMO | World Meteorological Organization | Arquivos de jogos | WMO Binary Format File | Unknown Software | Unknown Developer |
| .WNT | Raven software | Arquivos de jogos | Soldier of Fortune II Waypoint File | Soldier of Fortune II: Double Helix | Raven software |
| .WPL | Microsoft Corporation | Arquivos de jogos | Windows Media Player Playlist | Microsoft Windows Media Player | Microsoft Corporation |
| .WPT | Corel | Arquivos de jogos | WordPerfect Template | Corel WordPerfect X8 | Corel |
| .WRPL | Gaijin Entertainment | Arquivos de jogos | War Thunder Replay | War Thunder | Gaijin Entertainment |
| .WRPL.WGF | Widelands Development Team | Arquivos de jogos | Widelands Initial Saved Game File | Widelands | Widelands Development Team |
| .WS | MicroPro International Corp. | Arquivos de jogos | WordStar Document | Corel WordPerfect X8 | Corel |
| .WSC | Open Source | Arquivos de jogos | WonderSwan Color Game ROM | Oswan | Open Source |
| .WSS | Microsoft Corporation | Arquivos de jogos | Microsoft Windows Sound System File | Microsoft Windows | Microsoft Corporation |
| .WTF | Blizzard Entertainment Inc. | Arquivos de jogos | World Of Warcraft Text File | World of Warcraft | Blizzard Entertainment Inc. |
| .WTP | Satish Kumar | Arquivos de jogos | Wink Template | Wink | Satish Kumar |
| .WUD | CAST Group of Companies Inc. | Arquivos de jogos | Cast Soft Wysiwyg User Data | Cast Soft wysiwyg | CAST Software |
| .WWP | Microsoft Corporation | Arquivos de jogos | Microsoft Works Wizards File | Microsoft Works | Microsoft Corporation |
| .WWW | Ubisoft Blue Byte | Arquivos de jogos | ANNO 2070 World Configuration | ANNO 2070 | Ubisoft Blue Byte |
| .WX | Open Source | Arquivos de jogos | Wanam Xposed Backup File | Wanam Xposed | Open Source |
| .WXD | Relic Entertainment | Arquivos de jogos | Homeworld Musc Resource Game File | Homeworld | Relic Entertainment |
| .WXH | Relic Entertainment | Arquivos de jogos | Homeworld Game Sound Control File | Homeworld | Relic Entertainment |
| .WZ | Nexon | Arquivos de jogos | MapleStory Game Data File | MapleStroy | Nexon |
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