| .TPL | Unknown Developer | Spelbestanden | Document Template | NoteTab | Fookes Software |
| .TRE | TreeAge Software, Inc | Spelbestanden | TreeAge Decision Tree File | TreeAge Pro | TreeAge Software, Inc |
| .TRF | TorrentRover | Spelbestanden | TorrentRover File | TorrentRover | TorrentRover |
| .TRK | TwoNav | Spelbestanden | CompeGPS Land Track File | CompeGPS Land | TwoNav |
| .TRP | VSO Software | Spelbestanden | MPEG-2 HD Video Transport Stream | CyberLink PowerDVD | CyberLink |
| .TS4SCRIPT | Electronic Arts | Spelbestanden | The Sims 4 Script Archive | The Sims 4 | Electronic Arts |
| .TSC | DesignSoft | Spelbestanden | TINA Design File | DesignSoft TINA | DesignSoft |
| .TSI | Native Instruments | Spelbestanden | Traktor Settings File | Traktor | Native Instruments |
| .TT | Microsoft Corporation | Spelbestanden | Visual Studio Text Template | Microsoft Visual Studio | Microsoft Corporation |
| .TTG | Electronic Arts | Spelbestanden | Command & Conquer Red Alert 3 Data | Command & Conquer: Red Alert 3 | Electronic Arts |
| .TTL | Unknown Developer | Spelbestanden | AGT Game Title File | AGiliTy | Open Source |
| .TTM | SourceForge | Spelbestanden | Tower Toppler Mission File | Tower Toppler | SourceForge |
| .TUL | Fish Stick Games | Spelbestanden | Turbulance Level File | Turbulance | Fish Stick Games |
| .TUN | High Voltage Software | Spelbestanden | LEGO Racers Audio File | Audacity | Open Source |
| .TUT | Tilted Mill Entertainment | Spelbestanden | Children Of The Nile Tutorial File | Tilted Mill Entertainment Children of the Nile | Tilted Mill Entertainment |
| .TVI | Terminal Reality | Spelbestanden | Terminal Velocity Game Animation File | Terminal Velocity | Terminal Reality |
| .TWT | Stainless Games | Spelbestanden | Carmageddon 2 Data File | Carmageddon II: Carpocalypse Now | Stainless Games |
| .TXI | LucasArts Entertainment Company, LLC | Spelbestanden | KOTOR2 Game File | Star Wars: Knights of the Old Republic 2 | Obsidian Entertainment |
| .TZX | Kromasoft | Spelbestanden | Tanzzle Graphic Object File | Tanzzle Game | Kromasoft |
| .U | Epic Games | Spelbestanden | Unreal Tournament Class Package | Dragon UnPACKer | Open Source |
| .U8 | Nintendo | Spelbestanden | Mario Kart Wii Archive File | Wiimms SZS Toolset | Nintendo |
| .UBI | Ubisoft | Spelbestanden | Ubisoft Logo Animation | Unknown Software | Unknown Developer |
| .UC | Epic Games | Spelbestanden | UnrealScript Class | UnrealEd | Epic Games |
| .UCL | Tripwire, Inc. | Spelbestanden | Killing Floor System File | Killing Floor | Tripwire Interactive |
| .UCM | FAKT Software | Spelbestanden | Crazy Machines Model File | Crazy Machines | FAKT Software |
| .UCS | Relic Entertainment | Spelbestanden | Relic Localized Unicode Strings | Homeworld 2 | Sierra Entertainment |
| .UDM | Motcreations Software Inc. | Spelbestanden | MapView User-Defined Module File | MapView Virtual Gaming System | Motcreations Software Inc. |
| .UFO | Ulead Systems | Spelbestanden | Ulead File Object | Ulead Photo Express | Ulead Systems |
| .UGI | Paterva | Spelbestanden | MultiGo Game Data | MultiGo | Paterva |
| .UH | Ensemble Studios | Spelbestanden | Age Of Empires II (The Age Of Kings) File | Age of Empires II | Microsoft Corporation |
| .UHTM | Epic Games | Spelbestanden | Unreal Tournament Data File | Unreal Tournament | Epic Games |
| .UKX | Epic Games | Spelbestanden | Unreal Animation Package | Dragon UnPACKer | Open Source |
| .UMAP | Epic Games | Spelbestanden | Unreal Engine Map File | Unreal Tournament | Epic Games |
| .UMD | Ubisoft | Spelbestanden | Splinter Cell Blacklist Game Data File | Splinter Cell Blacklist | Ubisoft |
| .UMOD | Epic Games | Spelbestanden | Unreal Tournament Module File | Unreal Tournament | Epic Games |
| .UMV | Viacom New Media | Spelbestanden | Are You Afraid Of The Dark? Video Data | Are You Afraid of the Dark? The Tale of Orpheo's Curse | Viacom New Media |
| .UMX | Epic Games | Spelbestanden | Unreal Music Package | VLC Media Player | VideoLAN |
| .UNF | Open Source | Spelbestanden | UNIF ROM File | Nestopia | Open Source |
| .UNR | Unreal Software | Spelbestanden | Unreal Level Map | UnrealEd | Epic Games |
| .UPK | Epic Games | Spelbestanden | Unreal Engine 3 Package | Unreal Tournament | Epic Games |
| .UPS | Open Source | Spelbestanden | UPS Patch File | MultiPatch patching tool | Open Source |
| .UQM | Toys for Bob | Spelbestanden | The Ur-Quan Masters Archive File | The Ur-Quan Masters | Toys for Bob |
| .USA | Microsoft Corporation | Spelbestanden | American English Localization Language File | Microsoft Notepad | Microsoft Corporation |
| .USX | Epic Games | Spelbestanden | Unreal Static Meshes | Dragon UnPACKer | Open Source |
| .UT2 | Epic Games | Spelbestanden | Unreal Tournament 2003/2004 Map | Unreal Tournament | Epic Games |
| .UT2MOD | Epic Games | Spelbestanden | Unreal Tournament 2003/2004 Module File | Unreal Tournament 2003 | Epic Games |
| .UT3 | Epic Games | Spelbestanden | Unreal Tournament 3 Map File | Unreal Tournament | Epic Games |
| .UT4MOD | Epic Games | Spelbestanden | Unreal Tournament 2004 MOD Installation Package File | Unreal Tournament 2004 | Epic Games |
| .UTB | Unknown Developer | Spelbestanden | µTBackup Backup | µTBackup | Unknown Developer |
| .UTC | BioWare | Spelbestanden | BioWare Aurora Game Engine Creature Data File | Various video games | Various Developers |
| .UTD | BioWare | Spelbestanden | BioWare Aurora Game Engine Door File | BioWare Neverwinter Nights | BioWare |
| .UTI | BioWare | Spelbestanden | Bioware Aurora Item Data | BioWare Neverwinter Nights | BioWare |
| .UTP | BioWare | Spelbestanden | BioWare Aurora Game Engine Placeable Object File | BioWare Neverwinter Nights | BioWare |
| .UTS | BioWare | Spelbestanden | BioWare Aurora Game Engine Sound File | BioWare Neverwinter Nights | BioWare |
| .UTT | BioWare | Spelbestanden | Bioware Trigger File | BioWare Neverwinter Nights | BioWare |
| .UTW | BioWare | Spelbestanden | BioWare Aurora Engine Waypoint File | BioWare Neverwinter Nights | BioWare |
| .UTX | Epic Games | Spelbestanden | Unreal Texture Package | Dragon UnPACKer | Open Source |
| .UV2 | Electronic Arts | Spelbestanden | Jane's Combat Simulations: F-15 Game Data File | Jane's Combat Simulations: F-15 Game | Electronic Arts |
| .UVX | Epic Games | Spelbestanden | Unreal Tournament 2003 Saved Game File | Unreal Tournament 2003 | Epic Games |
| .UXX | Epic Games | Spelbestanden | Unreal Tournament 2003 Cache File | Unreal Tournament 2003 | Epic Games |
| .V | Microsoft Corporation | Spelbestanden | Subsampled Raw YUV Image | Microsoft Windows Media Player | Microsoft Corporation |
| .V64 | Nintendo | Spelbestanden | Nintendo 64 ROM Dump | Project64 | Open Source |
| .VB | Microsoft Corporation | Spelbestanden | Visual Basic Project Item File | Microsoft Notepad | Microsoft Corporation |
| .VBF | City Interactive | Spelbestanden | City Interactive Game Data File | XpoZed's Unpakke | nullsecurity organization |
| .VCM | LithJoe | Spelbestanden | Vice City Mod Manager File | Vice City Mod Manager | LithJoe |
| .VDF | Valve | Spelbestanden | Valve Data File | Microsoft Notepad | Microsoft Corporation |
| .VDK | GRAVITY | Spelbestanden | Ragnarok 2 Game Data File | Ragnarok Online | GRAVITY |
| .VEC | Omron Corporation | Spelbestanden | CX-Designer Shape File | OMRON CX-One | Omron Corporation |
| .VEF | BioWare | Spelbestanden | Infinite Game Engine Visual Effects File | Baldur's Gate | BioWare |
| .VEH | Raven software | Spelbestanden | Vehicle Data File | Raven Software Star Wars Jedi Knight: Jedi Academy | Valve |
| .VERSION | Open Source | Spelbestanden | Linux GateD Daemon Data | Linux | Open Source |
| .VFF | Sun Microsystems | Spelbestanden | Sun TAAC Graphic File | Lemkesoft GraphicConverter | Lemkesoft |
| .VFN | Firefly Studios | Spelbestanden | Stronghold 3 Game Data | Stronghold | Firefly Studios |
| .VHC | Big Red Software | Spelbestanden | Big Red Racing Vehicle File | Big Red Racing | Big Red Software |
| .VHV | Valve | Spelbestanden | Valve Source Lighting File | Valve Source | Valve |
| .VIS | Microsoft Corporation | Spelbestanden | Visibility Image File | Microsoft Flight Simulator 2004 | Microsoft Corporation |
| .VIV | Electronic Arts | Spelbestanden | Need For Speed Car Data File | Need For Speed | Electronic Arts |
| .VMF | Valve | Spelbestanden | Valve Map File | Valve Hammer Editor | Valve |
| .VMI | Sega | Spelbestanden | Dreamcast Doiwnload Info File | Dream Explorer | Open Source |
| .VMV | VBA Team | Spelbestanden | VisualBoyAdvance Recording | VisualBoyAdvance | VBA Team |
| .VMX | VMware | Spelbestanden | VMware Configuration File | VMware Workstation | VMware |
| .VOB | The DVD Forum | Spelbestanden | DVD Video Object File | CyberLink PowerDVD | CyberLink |
| .VOID | Valve | Spelbestanden | Half-life Map Voids File | Half-Life | Valve |
| .VOL | Open Source | Spelbestanden | Video Game Archive | Dragon UnPACKer | Open Source |
| .VP | Accellera Systems Initiative | Spelbestanden | Verilog Encrypted Source Code File | Xilinx ISE WebPACK | Xilinx, Inc. |
| .VPK | Valve | Spelbestanden | Valve Pak | Half-Life | Valve |
| .VPP | Visual Paradigm | Spelbestanden | Visual Paradigm Project File | Visual Paradigm Suite | Visual Paradigm |
| .VQA | Westwood Studios | Spelbestanden | Command And Conquer Game Video Files | Command and Conquer | Interscape |
| .VTF | Valve | Spelbestanden | Valve Texture File | VTF Explorer | Open Source |
| .VTX | Richard Bannister | Spelbestanden | VTX Chiptune File | Audio Overload | Richard Bannister |
| .VVS | Atari Corporation | Spelbestanden | Driver 3 Game Data | Driver 3 | Atari Corporation |
| .VVVVVV | Terry Cavanagh | Spelbestanden | VVVVVV Game Level File | VVVVVV | Terry Cavanagh |
| .VWP | Raven software | Spelbestanden | Vehicle Weapon File | Raven Software Star Wars Jedi Knight: Jedi Academy | Valve |
| .W | Progress Software Corporation | Spelbestanden | OpenEdge Architect Source Code File | OpenEdge | Progress Software Corporation |
| .W3G | Blizzard Entertainment Inc. | Spelbestanden | Warcraft 3 Replay File | Warcraft III | Blizzard Entertainment Inc. |
| .W3M | Blizzard Entertainment Inc. | Spelbestanden | Warcraft 3 Map File | Blizzard Warcraft 3 | Blizzard Entertainment Inc. |
| .W3N | Blizzard Entertainment Inc. | Spelbestanden | Warcraft 3 Expansion Campaign Map File | Warcraft III | Blizzard Entertainment Inc. |
| .W3P | Blizzard Entertainment Inc. | Spelbestanden | Warcraft 3 Progress File | Warcraft III | Blizzard Entertainment Inc. |
| .W3U | Blizzard Entertainment Inc. | Spelbestanden | Warcraft 3 Custom Units Data | Warcraft III | Blizzard Entertainment Inc. |
| .W3V | Blizzard Entertainment Inc. | Spelbestanden | Warcraft 3 Campaign Progress Record | Warcraft III | Blizzard Entertainment Inc. |
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