| .W3X | Blizzard Entertainment Inc. | Fichiers de jeu | Warcraft 3 Expansion Map FIle | Warcraft III | Blizzard Entertainment Inc. |
| .W3Z | Blizzard Entertainment Inc. | Fichiers de jeu | Warcraft 3 Saved Game File | Blizzard Warcraft 3 | Blizzard Entertainment Inc. |
| .WA2 | Midnight Synergy | Fichiers de jeu | Wonderland Adventures Custom Adventure File | Wonderland Adventures | Midnight Synergy |
| .WAD | id Software | Fichiers de jeu | Doom WAD File | Doom | id Software |
| .WAG | Kuju Entertainment | Fichiers de jeu | Train Simulator Wagon File | Microsoft Train Simulator | Kuju Entertainment |
| .WAGAME | Team17 | Fichiers de jeu | Worms Armageddon Game Recording | Worms Armageddon | Team17 |
| .WAL | Nullsoft | Fichiers de jeu | Winamp Modern Skin | Nullsoft Winamp | Nullsoft |
| .WAM | Team17 | Fichiers de jeu | Worms Armageddon Mission File | Worms Armageddon | Team17 |
| .WB | Electronic Arts | Fichiers de jeu | FIFA 2000 Game Data | FIFA 2000 | Electronic Arts |
| .WBT | Nabi Studios | Fichiers de jeu | Toribash Help File | Toribash | Nabi Studios |
| .WCFG | WildTangent | Fichiers de jeu | WildTangent Configuration | WildTangent Games App | WildTangent |
| .WD2 | Rockstar Games | Fichiers de jeu | American Idol Data | American Idol | Rockstar Games |
| .WDB | Microsoft Corporation | Fichiers de jeu | Microsoft Works Database | LibreOffice | The Document Foundation |
| .WDF | Workshare | Fichiers de jeu | Workshare Compare DeltaFile | Workshare Compare | Workshare |
| .WDR | Psion PLC | Fichiers de jeu | Psion Series 3 Printer Driver | Symbian OS | Nokia |
| .WEAP | id Software | Fichiers de jeu | Quake 3 Engine Weapon File | Microsoft Notepad | Microsoft Corporation |
| .WF | Electronic Arts | Fichiers de jeu | FIFA 2000 Game Data | FIFA 2000 | Electronic Arts |
| .WFE | PC SOFT | Fichiers de jeu | Crossword Express Word Find Puzzle | Crossword Express | PC SOFT |
| .WFT | Rockstar Games | Fichiers de jeu | GTA 4 Car Model File | Zanoza ZModeler | Zanoza Software |
| .WG | Electronic Arts | Fichiers de jeu | FIFA 2000 Game Data | FIFA 2000 | Electronic Arts |
| .WGAMEPROFILE | Activision | Fichiers de jeu | X-Men Origins: Wolverine Profile | X-Men Origin: Wolverine | Activision |
| .WGF | Widelands Development Team | Fichiers de jeu | Widelands Game File | Widelands | Widelands Development Team |
| .WGL | Accolade, Inc. | Fichiers de jeu | The Games: Winter Challenge Tournament File | Winter Challenge | Accolade, Inc. |
| .WGM | Open Source | Fichiers de jeu | Chalk Game Data | Chalk | Open Source |
| .WGPKG | Wargaming Group Limited | Fichiers de jeu | WarGaming Update Package | World of Tanks | Wargaming Group Limited |
| .WHM | Relic Entertainment | Fichiers de jeu | Warhammer 40,000: Dawn Of War Model File | Warhammer 40K Dawn of War | Relic Entertainment |
| .WI | Open Source | Fichiers de jeu | Wavelet Image | Corel Presentations X8 | Corel |
| .WJ | EA Maxis | Fichiers de jeu | FIFA 2000 Game File | FIFA 2000 | Electronic Arts |
| .WL1 | id Software | Fichiers de jeu | Wolfenstein 3D Data File | Wolfenstein 3D | id Software |
| .WL3 | id Software | Fichiers de jeu | Wolfenstein 3D Registered Version File | Wolfenstein 3D | id Software |
| .WL6 | id Software | Fichiers de jeu | Wolfenstein 3D Data File | Wolfenstein 3D | id Software |
| .WLL | Electronic Arts | Fichiers de jeu | The Sims Wall Texture File Format | The Sims | Electronic Arts |
| .WMF | Microsoft Corporation | Fichiers de jeu | Windows Metafile | Adobe Illustrator CC | Adobe Systems Incorporated |
| .WMO | World Meteorological Organization | Fichiers de jeu | WMO Binary Format File | Unknown Software | Unknown Developer |
| .WNT | Raven software | Fichiers de jeu | Soldier of Fortune II Waypoint File | Soldier of Fortune II: Double Helix | Raven software |
| .WPL | Microsoft Corporation | Fichiers de jeu | Windows Media Player Playlist | Microsoft Windows Media Player | Microsoft Corporation |
| .WPT | Corel | Fichiers de jeu | WordPerfect Template | Corel WordPerfect X8 | Corel |
| .WRPL | Gaijin Entertainment | Fichiers de jeu | War Thunder Replay | War Thunder | Gaijin Entertainment |
| .WRPL.WGF | Widelands Development Team | Fichiers de jeu | Widelands Initial Saved Game File | Widelands | Widelands Development Team |
| .WS | MicroPro International Corp. | Fichiers de jeu | WordStar Document | Corel WordPerfect X8 | Corel |
| .WSC | Open Source | Fichiers de jeu | WonderSwan Color Game ROM | Oswan | Open Source |
| .WSS | Microsoft Corporation | Fichiers de jeu | Microsoft Windows Sound System File | Microsoft Windows | Microsoft Corporation |
| .WTF | Blizzard Entertainment Inc. | Fichiers de jeu | World Of Warcraft Text File | World of Warcraft | Blizzard Entertainment Inc. |
| .WTP | Satish Kumar | Fichiers de jeu | Wink Template | Wink | Satish Kumar |
| .WUD | CAST Group of Companies Inc. | Fichiers de jeu | Cast Soft Wysiwyg User Data | Cast Soft wysiwyg | CAST Software |
| .WWP | Microsoft Corporation | Fichiers de jeu | Microsoft Works Wizards File | Microsoft Works | Microsoft Corporation |
| .WWW | Ubisoft Blue Byte | Fichiers de jeu | ANNO 2070 World Configuration | ANNO 2070 | Ubisoft Blue Byte |
| .WX | Open Source | Fichiers de jeu | Wanam Xposed Backup File | Wanam Xposed | Open Source |
| .WXD | Relic Entertainment | Fichiers de jeu | Homeworld Musc Resource Game File | Homeworld | Relic Entertainment |
| .WXH | Relic Entertainment | Fichiers de jeu | Homeworld Game Sound Control File | Homeworld | Relic Entertainment |
| .WZ | Nexon | Fichiers de jeu | MapleStory Game Data File | MapleStroy | Nexon |
| .X13 | DarXabre | Fichiers de jeu | Hooligans Game Archive File | Dragon UnPACKer | Open Source |
| .XA2 | Csabo | Fichiers de jeu | XWE Data File | XWE | Open Source |
| .XAC | Tilted Mill Entertainment | Fichiers de jeu | SimCity Societies Game File | SimCity Societies | Tilted Mill Entertainment |
| .XAN | Team17 | Fichiers de jeu | Worms Map File | Team17 Worms Mayhem | Team17 |
| .XCR | Strategic Studies Group | Fichiers de jeu | Warlords Battlecry Game File | Warlords Battlecry | Strategic Studies Group |
| .XDP | Adobe Systems Incorporated | Fichiers de jeu | XML Data Package | Adobe Acrobat DC | Adobe Systems Incorporated |
| .XDS | Nintendo | Fichiers de jeu | DS Game Maker Project File | Invisionsoft DS Game Maker | Nintendo |
| .XEN | Activision | Fichiers de jeu | Guitar Hero 3 Data File | Guitar Hero 3 | Neversoft |
| .XEX | Microsoft Corporation | Fichiers de jeu | Xbox 360 Executable File | Microsoft XBOX | Microsoft Corporation |
| .XMB | Microsoft Corporation | Fichiers de jeu | Age Of Empires Game Data File | Microsoft Age of Empires | Ensemble Studios |
| .XNB | Microsoft Corporation | Fichiers de jeu | XNA Game Studio Binary Package | Microsoft XNA Game Studio | Microsoft Corporation |
| .XOF | Themekit Systems Ltd | Fichiers de jeu | Reality Lab 3D Image File | MindRender Virtual Reality Explorer Kit | Themekit Systems Ltd |
| .XOM | Team17 | Fichiers de jeu | Worms 3D Object File | Team17 Worms Mayhem | Team17 |
| .XP | Starbreeze Studios | Fichiers de jeu | Fastracker 2 Pattern | Fasttracker | Starbreeze Studios |
| .XP3 | Open Source | Fichiers de jeu | KiriKiri Package File | XP3 / Kirikiri tools | Open Source |
| .XPC | Codejunkies | Fichiers de jeu | DSI Action Replay Saved Code | DSi Action Replay | Codejunkies |
| .XPD | Sony | Fichiers de jeu | PlayStation Store PSP License File | PlayStation | Sony |
| .XPK | THQ Nordic | Fichiers de jeu | WWE RAW Model File | Cygnus Hex Editor | SoftCircuits |
| .XPX | Intercon Associates | Fichiers de jeu | Intercon FormNet File | Accessible FormNet | Intercon Associates |
| .XRD | D. G. Jones and A. K. Dewdney | Fichiers de jeu | Core Wars Data | Core War | D. G. Jones and A. K. Dewdney |
| .XS | Microsoft Corporation | Fichiers de jeu | Age Of Empires 3 Map AI Generator | Microsoft Age of Empires | Ensemble Studios |
| .XTBL | Unknown Developer | Fichiers de jeu | XTBL Ransomware Encrypted File | AVG Antivirus | AVG Technologies |
| .XXI | IGN Entertainment | Fichiers de jeu | GameSpy Arcade Game File | GameSpy Arcade | IGN Entertainment |
| .XXW | Pandemic Studios | Fichiers de jeu | Zero Engine Terrain Data | Star War: The Clone Wars | LucasArts Entertainment Company, LLC |
| .XXX | BloodDolly | Fichiers de jeu | TeslaCrypt 3.0 Ransomware Encrypted File | Tesla Decoder | BloodDolly |
| .Y64 | Pyro Studios | Fichiers de jeu | Commandos 2 Game Mission | Commandos 2: Men of Courage | Pyro Studios |
| .YAP | Infogrames | Fichiers de jeu | Castles & Catapults Game File | Castles & Catapults | Infogrames |
| .YDC | KONAMI | Fichiers de jeu | Yu-Gi-Oh! Card Deck File | Konami Yu-Gi-Oh! Power of Chaos | KONAMI |
| .YDK | Open Source | Fichiers de jeu | Yu-Gi-Oh! Deck File | YGOPRO | Open Source |
| .YIF | VULPvibe Entertainment | Fichiers de jeu | Mungyodance Game Data File | Mungyodance | VULPvibe Entertainment |
| .YTD | Rockstar Games | Fichiers de jeu | Grand Theft Auto 5 Texture File | Grand Theft Auto V | Rockstar Games |
| .Z | Smith Micro Software | Fichiers de jeu | Unix Compressed File | 7-Zip | Igor Pavlov |
| .Z1 | Check Point Software Technologies Ltd. | Fichiers de jeu | ZoneAlarm Mailsafe Renamed Data | WinZip | Corel |
| .Z2 | Infocom | Fichiers de jeu | Z-machine Z-code Version 2 File | Windows Frotz | SourceForge |
| .Z2F | Microsoft Corporation | Fichiers de jeu | Zoo Tycoon 2 Object File | Zoo Tycoon 2 | Microsoft Corporation |
| .Z3 | Infocom | Fichiers de jeu | Z-machine Z-code Version 3 File | Windows Frotz | SourceForge |
| .Z4 | Infocom | Fichiers de jeu | Z-machine Z-code Version 4 File | Windows Frotz | SourceForge |
| .Z5 | Infocom | Fichiers de jeu | Z-machine Z-code Version 5 File | Windows Frotz | SourceForge |
| .Z64 | Open Source | Fichiers de jeu | Japanese Nintendo 64 Game ROM | Project64 | Open Source |
| .Z7 | Infocom | Fichiers de jeu | Z-machine Z-code Version 7 File | Windows Frotz | SourceForge |
| .ZA | nFusion Interactive | Fichiers de jeu | nFusion Game Data | Elite Warriors: Vietnam | nFusion Interactive |
| .ZAD | Predrag Brodanac | Fichiers de jeu | ZadGen Document File | ZadGen | Predrag Brodanac |
| .ZAR | Sony | Fichiers de jeu | PlayStation 2 Audio Data | PlayStation 2 | Sony |
| .ZDK | id Software | Fichiers de jeu | ZQuake Game Data | ZQuake | id Software |
| .ZEI | Ubisoft | Fichiers de jeu | ANNO 1602 Game Data | Anno 1602 | Ubisoft |
| .ZFS | Activision | Fichiers de jeu | Interstate '76 And '82 Game Archive File | Interstate '76 | Activision |
| .ZGEPROJ | Unknown Developer | Fichiers de jeu | ZGame Editor Project File | ZGameEditor | Unknown Developer |
| .ZIP | Winrar | Fichiers de jeu | Zipped File | 7-Zip | Igor Pavlov |
| .ZM3 | Check Point Software Technologies Ltd. | Fichiers de jeu | ZoneAlarm Mailsafe Renamed Data | WinZip | Corel |
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