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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .T64 | Commodore International | Disk Image Files | Commodore 64 Tape Image File | VICE | Open Source |
| .TAP | Various Developers | Disk Image Files | Commodore 64 Cassette Tape Image | Fuse | Open Source |
| .TAR | Jean-loup Gailly and Mark Adler | Data Files | Consolidated Unix File Archive | PeaZip | Open Source |
| .TBN | Open Source | Raster Image Files | Kodi Thumbnail Image | Kodi | Open Source |
| .TBX | Simple DirectMedia Layer (SDL) | Data Files | SDL Trados Studio Glossary Data | PSPad | Open Source |
| .TBZ2 | Winrar | Compressed Files | Tar BZip 2 Compressed File | PeaZip | Open Source |
| .TCL | Open Source | Developer Files | Tcl Script | PSPad | Open Source |
| .TCM | IMSI/Design, LLC | CAD Files | TurboCAD Mac Drawing | PSPad | Open Source |
| .TEX | Open Source | Text Files | LaTeX Source Document | gVim | Open Source |
| .TGM | Open Source | 3D Image Files | Nem's Mega 3D Terrain Generator | Nem's Mega 3D Terrain Generator | Open Source |
| .TGT | Corel | Data Files | Corel Custom Data | Watcom C/C++ | Open Source |
| .TH | Open Source | GIS Files | Therion Data File | Therion | Open Source |
| .THM | Sony | Uncommon Files | Sony Ericsson Mobile Phone Theme File | IrfanView | Open Source |
| .THOR | Sublime HQ Pty Ltd | Developer Files | Thor Source Code | PSPad | Open Source |
| .THX | Cloanto Corporation | Audio Files | Amiga THX Tracker Music File | CocoModX | Open Source |
| .TI | timber-lang.org | Developer Files | Timber Compiler | Open Turing | Open Source |
| .TIF | XnSoft | Raster Image Files | Tagged Image File Format | IrfanView | Open Source |
| .TIFF | XnSoft | Raster Image Files | Tagged Image File Format | IrfanView | Open Source |
| .TIG | Texas Instruments, Inc. | Backup Files | TI Connect Backup File | COREX | Open Source |
| .TIM | Sierra Entertainment | Game Files | The Incredible Machine Level | Vixen Lights | Open Source |
| .TK | Procedimientos-Uno, S.L. | Data Files | TeKton3D Project | Tclsh | Open Source |
| .TLD | The Eclipse Foundation | Developer Files | Tag Library Descriptor File | NetBeans | Open Source |
| .TLL | LG Electronics | Settings Files | LG TV Link-Loader File | ChanSort | Open Source |
| .TOD | JVCKenwood Group | Video Files | JVC Everio Video Capture File | Squared 5 MPEG Streamclip | Open Source |
| .TODO | Open Source | Text Files | Simple Project ToDo Database | Simple Project ToDo | Open Source |
| .TOM | Aptora | Data Files | Total Office Manager Accounting Data | PSPad | Open Source |
| .TORRENT | BitTorrent | Uncommon Files | BitTorrent Information File | Shareaza | Open Source |
| .TP2 | Unknown Developer | Data Files | WeiDU Resource Pack File | WeiDU | Open Source |
| .TPF | IBM | Settings Files | SPSS Text Wizard Document | TexMod | Open Source |
| .TPR | Pegasys | Video Files | TMPGEnc Project File | Media Player Classic | Open Source |
| .TPZ | Amazon | eBook Files | Kindle Topaz eBook File | Calibre | Open Source |
| .TR | Yadabyte | eBook Files | TomeRaider 2 eBook File | ISOLINUX | Open Source |
| .TRI | Singular Inversions | 3D Image Files | FaceGen Polygonal Model File | AbiWord | Open Source |
| .TRK | TwoNav | Data Files | CompeGPS Land Track File | GPSBabel | Open Source |
| .TRP | VSO Software | Video Files | MPEG-2 HD Video Transport Stream | SMPlayer | Open Source |
| .TS | Various Developers | Video Files | Video Transport Stream File | Squared 5 MPEG Streamclip | Open Source |
| .TS2 | Open Source | Data Files | Time Stamp Project Information File | Time Stamp | Open Source |
| .TSK | Microsoft Corporation | Settings Files | Pocket PC Skin | Task Coach | Open Source |
| .TSO | Siemens AG | 3D Image Files | NX2 File 3D Faceted Spacial Volume Data | TSO Editor | Open Source |
| .TSTREAM | Open Source | Uncommon Files | SwarmPlayer Streaming Torrent | SwarmPlayer | Open Source |
| .TTA | True Audio | Audio Files | True Audio File | XMMS | Open Source |
| .TTC | Various Developers | Font Files | TrueType Font Collection | FontForge | Open Source |
| .TTF | Apple | Font Files | TrueType Font | FontForge | Open Source |
| .TTL | Unknown Developer | Game Files | AGT Game Title File | AGiliTy | Open Source |
| .TTS | SumTotal Systems | Data Files | ToolBook Translation System File | Media Player Classic | Open Source |
| .TUN | High Voltage Software | Audio Files | LEGO Racers Audio File | Audacity | Open Source |
| .TWL | Open Source | GIS Files | Naviguide Binary GPS Track Data File | GPSBabel | Open Source |
| .TX8 | Microsoft Corporation | Text Files | DOS Text File | PSPad | Open Source |
| .TXL | Open Source | Developer Files | TXL Source Code | PSPad | Open Source |
| .TXS | Delphi Softwares | Uncommon Files | Beast (Trojan Horse) Data File | Tiny XML Server | Open Source |
| .TXTZ | Open Source | eBook Files | Compressed eBook File | Calibre | Open Source |
| .TXX | National Library of Medicine | Developer Files | Insight Segmentation And Registration Toolkit Data File | Insight Segmentation and Registration Toolkit | Open Source |
| .TXZ | Open Source | Compressed Files | XZ Compressed Tar Archive | Tukaani XZ Utils | Open Source |
| .TZX | Kromasoft | Game Files | Tanzzle Graphic Object File | Fuse | Open Source |
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