| .T3 | Michael J. Roberts | Arquivos de jogos | TADS 3 Game Data | TADS | Michael J. Roberts |
| .T3D | Epic Games | Arquivos de jogos | Unreal Engine 3D Object File | Unreal Tournament | Epic Games |
| .TAD | Cavedog | Arquivos de jogos | Total Annihilation Demo Saved Game Data | Total Annihilation | Cavedog |
| .TAF | Campbell Wild | Arquivos de jogos | ADRIFT Text Adventure File | ADRIFT Generator | Campbell Wild |
| .TAP | Various Developers | Arquivos de jogos | Commodore 64 Cassette Tape Image | Fuse | Open Source |
| .TAS | Campbell Wild | Arquivos de jogos | ADRIFT Text Adventure Saved Game | ADRIFT Generator | Campbell Wild |
| .TASP | Unknown Developer | Arquivos de jogos | Strategy Planner Data File | Tactical Assault Strategy Planner | Unknown Developer |
| .TBC | Psygnosis | Arquivos de jogos | Formula One 2001 Season 01 Vehicles Data | Formula One 2001 | Psygnosis |
| .TBI | Electronic Arts | Arquivos de jogos | FIFA 2001 Game Data | FIFA 2001 | EA Sports |
| .TBM | Nabi Studios | Arquivos de jogos | Toribash Mod File | Toribash | Nabi Studios |
| .TBV | Brain Innovation | Arquivos de jogos | Turbo-BrainVoyager Data File | Turbo-BrainVoyager | Brain Innovation |
| .TCM | IMSI/Design, LLC | Arquivos de jogos | TurboCAD Mac Drawing | IMSI TurboCAD Deluxe | Redway3d and others |
| .TCT | Adtollo | Arquivos de jogos | Topocad File | Topocad | Adtollo |
| .TD4 | Chris Sawyer | Arquivos de jogos | RollerCoaster Tycoon Track File | RollerCoaster Tycoon | Chris Sawyer |
| .TD6 | Chris Sawyer | Arquivos de jogos | RollerCoaster Tycoon 2 File | RollerCoaster Tycoon 2: Triple Thrill Pack | Chris Sawyer |
| .TDB | Google | Arquivos de jogos | Android Thumbnail Cache | Google Android | Google |
| .TDF | DVD Copy | Arquivos de jogos | Title Definition Format File | DVD X Copy | DVD Copy |
| .TDT | Sony | Arquivos de jogos | AVCHD Thumbnail File | Unknown Software | Unknown Developer |
| .TDX | D-TEG Security Co. | Arquivos de jogos | D-TEG CCTV Video Information File | D-TEG MRX PC Client | D-TEG Security Co. |
| .TER | Planetside Software | Arquivos de jogos | Terragen Terrain File | Planetside Software Terragen | Planetside Software |
| .TET | RM Education | Arquivos de jogos | Textease CT Template | Textease Studio | RM Education |
| .TF2 | Valve | Arquivos de jogos | Team Fortress 2 Data File | Team Fortress 2 | Valve |
| .TFR | LucasArts Entertainment Company, LLC | Arquivos de jogos | TIE Fighter Pilot File | Star Wars: TIE Fighter | LucasArts Entertainment Company, LLC |
| .TGH | Neversoft | Arquivos de jogos | Guitar Hero 3 Tier Settings File | Guitar Hero 3 | Neversoft |
| .TGI | Electronic Arts | Arquivos de jogos | SimCity 4 File | Electronic Arts SimCity 4 | Electronic Arts |
| .TGX | Firefly Studios | Arquivos de jogos | Stronghold Animated Data | Stronghold | Firefly Studios |
| .TI | timber-lang.org | Arquivos de jogos | Timber Compiler | Timber | timber-lang.org |
| .TIM | Sierra Entertainment | Arquivos de jogos | The Incredible Machine Level | The Incredible Machine | Sierra Entertainment |
| .TIS | Acronis | Arquivos de jogos | True Image Script | Acronis True Image | Acronis |
| .TIT | Microsoft Corporation | Arquivos de jogos | Train Simulator Track Interactive Table File | Microsoft Train Simulator | Kuju Entertainment |
| .TJA | TaikoJiro | Arquivos de jogos | Taikojiro Song Map File | Taikojiro | TaikoJiro |
| .TJC | TaikoJiro | Arquivos de jogos | Taikojiro Song Map Sequence File | Taikojiro | TaikoJiro |
| .TL_ | Spiele-Palast GmbH | Arquivos de jogos | Doko Game File | Doko | Spiele-Palast GmbH |
| .TML | Odetics Broadcast | Arquivos de jogos | AIRO Timeline File Format | AIRO | Odetics Broadcast |
| .TMR | Apimac | Arquivos de jogos | Apimac Timer Document | Apimac Timer | Apimac |
| .TNI | Sega | Arquivos de jogos | Sega Virtua Tennis Menufiles Common File | Virtua Tennis | Sega |
| .TOC | Sony | Arquivos de jogos | Sony PlayStation Portable (PSP) Audio File | Exact Audio Copy for PSP Edition | Interscape |
| .TOD | JVCKenwood Group | Arquivos de jogos | JVC Everio Video Capture File | VLC Media Player | VideoLAN |
| .TOR | LucasArts Entertainment Company, LLC | Arquivos de jogos | Star Wars: The Old Republic Asset File | StarWars | BioWare |
| .TOY | Ubisoft | Arquivos de jogos | Catz & Dogz Game File | Catz | Ubisoft |
| .TP4 | Chris Sawyer | Arquivos de jogos | RollerCoaster Tycoon Track Picture File | RollerCoaster Tycoon 3 | Frontier Developments plc |
| .TPJ | National Instruments | Arquivos de jogos | NI TestStand Project | NI TestStand | National Instruments |
| .TPL | Unknown Developer | Arquivos de jogos | Document Template | NoteTab | Fookes Software |
| .TRE | TreeAge Software, Inc | Arquivos de jogos | TreeAge Decision Tree File | TreeAge Pro | TreeAge Software, Inc |
| .TRF | TorrentRover | Arquivos de jogos | TorrentRover File | TorrentRover | TorrentRover |
| .TRK | TwoNav | Arquivos de jogos | CompeGPS Land Track File | CompeGPS Land | TwoNav |
| .TRP | VSO Software | Arquivos de jogos | MPEG-2 HD Video Transport Stream | CyberLink PowerDVD | CyberLink |
| .TS4SCRIPT | Electronic Arts | Arquivos de jogos | The Sims 4 Script Archive | The Sims 4 | Electronic Arts |
| .TSC | DesignSoft | Arquivos de jogos | TINA Design File | DesignSoft TINA | DesignSoft |
| .TSI | Native Instruments | Arquivos de jogos | Traktor Settings File | Traktor | Native Instruments |
| .TT | Microsoft Corporation | Arquivos de jogos | Visual Studio Text Template | Microsoft Visual Studio | Microsoft Corporation |
| .TTG | Electronic Arts | Arquivos de jogos | Command & Conquer Red Alert 3 Data | Command & Conquer: Red Alert 3 | Electronic Arts |
| .TTL | Unknown Developer | Arquivos de jogos | AGT Game Title File | AGiliTy | Open Source |
| .TTM | SourceForge | Arquivos de jogos | Tower Toppler Mission File | Tower Toppler | SourceForge |
| .TUL | Fish Stick Games | Arquivos de jogos | Turbulance Level File | Turbulance | Fish Stick Games |
| .TUN | High Voltage Software | Arquivos de jogos | LEGO Racers Audio File | Audacity | Open Source |
| .TUT | Tilted Mill Entertainment | Arquivos de jogos | Children Of The Nile Tutorial File | Tilted Mill Entertainment Children of the Nile | Tilted Mill Entertainment |
| .TVI | Terminal Reality | Arquivos de jogos | Terminal Velocity Game Animation File | Terminal Velocity | Terminal Reality |
| .TWT | Stainless Games | Arquivos de jogos | Carmageddon 2 Data File | Carmageddon II: Carpocalypse Now | Stainless Games |
| .TXI | LucasArts Entertainment Company, LLC | Arquivos de jogos | KOTOR2 Game File | Star Wars: Knights of the Old Republic 2 | Obsidian Entertainment |
| .TZX | Kromasoft | Arquivos de jogos | Tanzzle Graphic Object File | Tanzzle Game | Kromasoft |
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