| .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 |
| .X13 | DarXabre | Arquivos de jogos | Hooligans Game Archive File | Dragon UnPACKer | Open Source |
| .XA2 | Csabo | Arquivos de jogos | XWE Data File | XWE | Open Source |
| .XAC | Tilted Mill Entertainment | Arquivos de jogos | SimCity Societies Game File | SimCity Societies | Tilted Mill Entertainment |
| .XAN | Team17 | Arquivos de jogos | Worms Map File | Team17 Worms Mayhem | Team17 |
| .XCR | Strategic Studies Group | Arquivos de jogos | Warlords Battlecry Game File | Warlords Battlecry | Strategic Studies Group |
| .XDP | Adobe Systems Incorporated | Arquivos de jogos | XML Data Package | Adobe Acrobat DC | Adobe Systems Incorporated |
| .XDS | Nintendo | Arquivos de jogos | DS Game Maker Project File | Invisionsoft DS Game Maker | Nintendo |
| .XEN | Activision | Arquivos de jogos | Guitar Hero 3 Data File | Guitar Hero 3 | Neversoft |
| .XEX | Microsoft Corporation | Arquivos de jogos | Xbox 360 Executable File | Microsoft XBOX | Microsoft Corporation |
| .XMB | Microsoft Corporation | Arquivos de jogos | Age Of Empires Game Data File | Microsoft Age of Empires | Ensemble Studios |
| .XNB | Microsoft Corporation | Arquivos de jogos | XNA Game Studio Binary Package | Microsoft XNA Game Studio | Microsoft Corporation |
| .XOF | Themekit Systems Ltd | Arquivos de jogos | Reality Lab 3D Image File | MindRender Virtual Reality Explorer Kit | Themekit Systems Ltd |
| .XOM | Team17 | Arquivos de jogos | Worms 3D Object File | Team17 Worms Mayhem | Team17 |
| .XP | Starbreeze Studios | Arquivos de jogos | Fastracker 2 Pattern | Fasttracker | Starbreeze Studios |
| .XP3 | Open Source | Arquivos de jogos | KiriKiri Package File | XP3 / Kirikiri tools | Open Source |
| .XPC | Codejunkies | Arquivos de jogos | DSI Action Replay Saved Code | DSi Action Replay | Codejunkies |
| .XPD | Sony | Arquivos de jogos | PlayStation Store PSP License File | PlayStation | Sony |
| .XPK | THQ Nordic | Arquivos de jogos | WWE RAW Model File | Cygnus Hex Editor | SoftCircuits |
| .XPX | Intercon Associates | Arquivos de jogos | Intercon FormNet File | Accessible FormNet | Intercon Associates |
| .XRD | D. G. Jones and A. K. Dewdney | Arquivos de jogos | Core Wars Data | Core War | D. G. Jones and A. K. Dewdney |
| .XS | Microsoft Corporation | Arquivos de jogos | Age Of Empires 3 Map AI Generator | Microsoft Age of Empires | Ensemble Studios |
| .XTBL | Unknown Developer | Arquivos de jogos | XTBL Ransomware Encrypted File | AVG Antivirus | AVG Technologies |
| .XXI | IGN Entertainment | Arquivos de jogos | GameSpy Arcade Game File | GameSpy Arcade | IGN Entertainment |
| .XXW | Pandemic Studios | Arquivos de jogos | Zero Engine Terrain Data | Star War: The Clone Wars | LucasArts Entertainment Company, LLC |
| .XXX | BloodDolly | Arquivos de jogos | TeslaCrypt 3.0 Ransomware Encrypted File | Tesla Decoder | BloodDolly |
| .Y64 | Pyro Studios | Arquivos de jogos | Commandos 2 Game Mission | Commandos 2: Men of Courage | Pyro Studios |
| .YAP | Infogrames | Arquivos de jogos | Castles & Catapults Game File | Castles & Catapults | Infogrames |
| .YDC | KONAMI | Arquivos de jogos | Yu-Gi-Oh! Card Deck File | Konami Yu-Gi-Oh! Power of Chaos | KONAMI |
| .YDK | Open Source | Arquivos de jogos | Yu-Gi-Oh! Deck File | YGOPRO | Open Source |
| .YIF | VULPvibe Entertainment | Arquivos de jogos | Mungyodance Game Data File | Mungyodance | VULPvibe Entertainment |
| .YTD | Rockstar Games | Arquivos de jogos | Grand Theft Auto 5 Texture File | Grand Theft Auto V | Rockstar Games |
| .Z | Smith Micro Software | Arquivos de jogos | Unix Compressed File | 7-Zip | Igor Pavlov |
| .Z1 | Check Point Software Technologies Ltd. | Arquivos de jogos | ZoneAlarm Mailsafe Renamed Data | WinZip | Corel |
| .Z2 | Infocom | Arquivos de jogos | Z-machine Z-code Version 2 File | Windows Frotz | SourceForge |
| .Z2F | Microsoft Corporation | Arquivos de jogos | Zoo Tycoon 2 Object File | Zoo Tycoon 2 | Microsoft Corporation |
| .Z3 | Infocom | Arquivos de jogos | Z-machine Z-code Version 3 File | Windows Frotz | SourceForge |
| .Z4 | Infocom | Arquivos de jogos | Z-machine Z-code Version 4 File | Windows Frotz | SourceForge |
| .Z5 | Infocom | Arquivos de jogos | Z-machine Z-code Version 5 File | Windows Frotz | SourceForge |
| .Z64 | Open Source | Arquivos de jogos | Japanese Nintendo 64 Game ROM | Project64 | Open Source |
| .Z7 | Infocom | Arquivos de jogos | Z-machine Z-code Version 7 File | Windows Frotz | SourceForge |
| .ZA | nFusion Interactive | Arquivos de jogos | nFusion Game Data | Elite Warriors: Vietnam | nFusion Interactive |
| .ZAD | Predrag Brodanac | Arquivos de jogos | ZadGen Document File | ZadGen | Predrag Brodanac |
| .ZAR | Sony | Arquivos de jogos | PlayStation 2 Audio Data | PlayStation 2 | Sony |
| .ZDK | id Software | Arquivos de jogos | ZQuake Game Data | ZQuake | id Software |
| .ZEI | Ubisoft | Arquivos de jogos | ANNO 1602 Game Data | Anno 1602 | Ubisoft |
| .ZFS | Activision | Arquivos de jogos | Interstate '76 And '82 Game Archive File | Interstate '76 | Activision |
| .ZGEPROJ | Unknown Developer | Arquivos de jogos | ZGame Editor Project File | ZGameEditor | Unknown Developer |
| .ZIP | Winrar | Arquivos de jogos | Zipped File | 7-Zip | Igor Pavlov |
| .ZM3 | Check Point Software Technologies Ltd. | Arquivos de jogos | ZoneAlarm Mailsafe Renamed Data | WinZip | Corel |
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