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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .TEK | Unknown Developer | Data Files | ASITIC Technology File | ASITIC | Unknown Developer |
| .TELL | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .TEM | E J Software | Data Files | Badge Designer 2000 Data | Badge Designer 2000 | E J Software |
| .TER | Planetside Software | Data Files | Terragen Terrain File | Planetside Software Terragen | Planetside Software |
| .TEST | Unknown Developer | Data Files | Testing File | Unknown Software | Unknown Developer |
| .TESTING | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .TET | RM Education | Data Files | Textease CT Template | Textease Studio | RM Education |
| .TEXI | GNU Project | Data Files | TEXinfo File Format | TexInfo | GNU Project |
| .TFA | Tree Software and Consulting Inc. | Data Files | TreeSoft CashFlow Analysis Data File | treeSoft CashFlow Analysis (tree.fa.exe) | treeSoft |
| .TFD | Various Developers | Data Files | Tape Format Requirements Document | BAE Systems VITec PC | BAE Systems |
| .TFH | Borland | Data Files | Turbo Profiler Help Data File | Turbo Profiler | Borland |
| .TFM | Jonathan Kew and Stefan Löffler | Data Files | TeX Font Metric File | MiKTeX | Christian Schenk |
| .TFR | LucasArts Entertainment Company, LLC | Data Files | TIE Fighter Pilot File | Star Wars: TIE Fighter | LucasArts Entertainment Company, LLC |
| .TFS | Borland | Data Files | Turbo Profiler Statistical Information Data | Turbo Profiler | Borland |
| .TFT | FormatBlue Software | Data Files | Text Formatter Plus File | Text Formatter Plus | FormatBlue Software |
| .TFU | Two notes Audio Engineering | Data Files | Torpedo Live Firmware Update | Torpedo Live | Two notes Audio Engineering |
| .TFW | ESRI | Data Files | World File For TIFF | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .TFX | Avid Technology | Data Files | Pro Tools Eleven Rack Plugin Preset File | Avid Pro Tools | Avid Technology |
| .TGD | Planetside Software | Data Files | Terragen Project File | Planetside Software Terragen | Planetside Software |
| .TGF | Unknown Developer | Data Files | Trivial Graph Format File | Wolfram Research Mathematica | Wolfram Research |
| .TGS | GeneStudio, Inc. | Data Files | GSTree Phylogenetic Tree Information Data | GeneStudio Pro | GeneStudio, Inc. |
| .TGT | Corel | Data Files | Corel Custom Data | CorelDRAW Graphics Suite | Corel |
| .TH | Open Source | Data Files | Therion Data File | Therion | Open Source |
| .THR | PTC | Data Files | Pro/ENGINEER File | Pro/ENGINEER | PTC |
| .THS | Corel | Data Files | Corel WordPerfect Thesaurus Dictionary | Corel WordPerfect | Corel |
| .TIA | Siemens AG | Data Files | Siemens TIA Portal Data | TIA Portal | Siemens AG |
| .TIC | ESRI | Data Files | ArcInfo Coordinates File | ArcInfo | ESRI |
| .TICKET | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .TID | Sony | Data Files | AVCHD Thumbnail File | Unknown Software | Unknown Developer |
| .TIE | Codeweavers | Data Files | CrossTie Installer File | CrossOver | Codeweavers |
| .TIPS | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .TIS | Acronis | Data Files | True Image Script | Acronis True Image | Acronis |
| .TITLE | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .TJM | Reallusion, Inc. | Data Files | CrazyTalk Model File | CrazyTalk | Reallusion, Inc. |
| .TK | Procedimientos-Uno, S.L. | Data Files | TeKton3D Project | TeKton3D | Procedimientos-Uno, S.L. |
| .TKB | Elk River Systems | Data Files | TicketBench Data File | TicketBench | Elk River Systems |
| .TKL | Interscape | Data Files | Takeoff Live PDF Working Data | Takeoff Live | Interscape |
| .TKT | Universal Technical Systems | Data Files | TK Solver File | TK Solver | Universal Technical Systems |
| .TKW | Universal Technical Systems | Data Files | TK Solver File | TK Solver | Universal Technical Systems |
| .TL5 | Tom Snyder Productions, Inc. | Data Files | Timeliner 5 File | TimeLiner 5.0 | Tom Snyder Productions, Inc. |
| .TLM | Progeny Software Inc. | Data Files | Timeline Maker Timeline | Timeline Maker Professional | Progeny Software Inc. |
| .TLR | Tableau Software | Data Files | Tableau Offline License Registration File | Tableau Desktop | Tableau Software |
| .TMA | DCI | Data Files | DCI TradeManager Catalog Archive | DCI TradeManager | DCI |
| .TMB | ARRIS | Data Files | Timbuktu Pro Connection Document | Timbuktu | ARRIS |
| .TMD | SoftMaker Software | Data Files | TextMaker Document | Softmaker Office | SoftMaker Software |
| .TMK | Embarcadero Technologies | Data Files | Turbo Pascal Tour File | Turbo Pascal | Embarcadero Technologies |
| .TML | Odetics Broadcast | Data Files | AIRO Timeline File Format | AIRO | Odetics Broadcast |
| .TMQ | Bob Beveridge | Data Files | TestMaster Questions Data | TestMaster | Bob Beveridge |
| .TMR | Apimac | Data Files | Apimac Timer Document | Apimac Timer | Apimac |
| .TMW | Simple DirectMedia Layer (SDL) | Data Files | Translation Memory Data File | SDL Trados | SDL Trados |
| .TMX | Heartsome Technologies Ltd | Data Files | Heartsome TMX Editor File | Heartsome TMX editor | Heartsome Technologies Ltd |
| .TNO | Texas Instruments, Inc. | Data Files | Handheld Operating System Image | Texas Instruments TI-Nspire Software | Texas Instruments, Inc. |
| .TNT | TurnTool Aps | Data Files | TurnTool 3D Model | TurnTool | TurnTool Aps |
| .TNX | Page Technology Marketing, Inc | Data Files | PCLTool File | PCLTool | Page Technology Marketing, Inc |
| .TO | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .TOL | AOL | Data Files | AOL Tool File | America Online | Verizon |
| .TOM | Aptora | Data Files | Total Office Manager Accounting Data | Total Office Manager | Aptora |
| .TON | HeiRue-Soft | Data Files | FMS32 Protocol File | FMS32 | HeiRue-Soft |
| .TOOL | Apple | Data Files | Apple Terminal Data | Apple Terminal | Apple |
| .TOP | KTH Royal Institute of Technology | Data Files | Gromacs Topology File | Gromacs | KTH Royal Institute of Technology |
| .TOPC | 3d-scape Limited | Data Files | TopicCrunch Project File | Microsoft Notepad | Microsoft Corporation |
| .TP | SnapStream Media | Data Files | Beyond TV Transport Stream File | CyberLink PowerDVD | CyberLink |
| .TP2 | Unknown Developer | Data Files | WeiDU Resource Pack File | WeiDU | Open Source |
| .TPE | SoftVelocity | Data Files | Clarion Example File | Clarion | SoftVelocity |
| .TPF | IBM | Data Files | SPSS Text Wizard Document | IBM SPSS | IBM |
| .TPJ | National Instruments | Data Files | NI TestStand Project | NI TestStand | National Instruments |
| .TPP | Ternion Corporation | Data Files | FLAMES GUI Template File | FLAMES | Ternion Corporation |
| .TPR | Pegasys | Data Files | TMPGEnc Project File | Media Player Classic | Open Source |
| .TPT | Cerious Software | Data Files | ThumbsPlus Thumbnail Template | ThumbsPlus | Cerious Software |
| .TQI | Parasoft | Data Files | Insure++ Interface Data | Insure++ | Parasoft |
| .TR1 | IBM | Data Files | IBM Voice Type Languages Addword File | IBM Voice Type | IBM |
| .TR2 | Yadabyte | Data Files | TomeRaider eBook File | TomeRaider | Yadabyte |
| .TR3 | Yadabyte | Data Files | TomeRaider eBook File | TomeRaider | Yadabyte |
| .TR4 | National Instruments | Data Files | SPICE Transient Analysis Output Data File | Spice | National Instruments |
| .TR5 | Onyx Computing | Data Files | OnyxTree Professional Data | OnyxTREE BROADLEAF | Onyx Computing |
| .TR6 | National Instruments | Data Files | SPICE Transient Analysis Output Data File | Spice | National Instruments |
| .TR7 | National Instruments | Data Files | SPICE Transient Analysis Output Data File | Spice | National Instruments |
| .TR8 | National Instruments | Data Files | SPICE Transient Analysis Output Data File | Spice | National Instruments |
| .TR9 | National Instruments | Data Files | SPICE Transient Analysis Output Data File | Spice | National Instruments |
| .TRA | Interscape | Data Files | WinTrack Railroad Track Text File | WinTrack | Interscape |
| .TRACE | VMware | Data Files | VMware ThinApp Trace Log File | VMware ThinApp 5 Suite | VMware |
| .TRACK0 | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .TRACKS | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .TRAVEL | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .TRB | Hash | Data Files | Animation Master Turbulence Plug-in | Animation:Master | Hash |
| .TRD | Marco Pontello | Data Files | TrID Definitions Package | TrID | Marco Pontello |
| .TRE | TreeAge Software, Inc | Data Files | TreeAge Decision Tree File | TreeAge Pro | TreeAge Software, Inc |
| .TRF | TorrentRover | Data Files | TorrentRover File | TorrentRover | TorrentRover |
| .TRG | Symantec Corporation | Data Files | Symantec LiveUpdate File | Norton SystemWorks | Symantec Corporation |
| .TRH | Traverse PC | Data Files | Traverse PC Handheld Survey Data | Traverse PC Handheld | Traverse PC |
| .TRIAL | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .TRK | TwoNav | Data Files | CompeGPS Land Track File | CompeGPS Land | TwoNav |
| .TRM | Oracle Corporation | Data Files | Oracle Trace Map File | Oracle Database | Oracle Corporation |
| .TRO | IBM | Data Files | IBM Voice Type Languages Vocable File | IBM Voice Type | IBM |
| .TRS | Interscape | Data Files | WinTrack Railroad Track Text File | WinTrack | Interscape |
| .TRUETYPE | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .TRV | Traverse PC | Data Files | Traverse PC Desktop Survey Data File | Traverse PC Handheld | Traverse PC |
| .TRX | Microsoft Corporation | Data Files | Visual Studio Test Results File | Microsoft Visual Studio | Microsoft Corporation |
| .TS | Various Developers | Data 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 |
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