| .T | Holt Software | Gegevensbestanden | Turing Source Code File | Holt Software Turing | Holt Software |
| .T01 | H&R Block | Gegevensbestanden | TaxCut 2001 File | H&R Block TaxCut 2001 | H&R Block |
| .T02 | H&R Block | Gegevensbestanden | TaxCut 2002 File | H&R Block TaxCut 2002 | H&R Block |
| .T03 | H&R Block | Gegevensbestanden | TaxCut 2003 File | H&R Block TaxCut 2003 | H&R Block |
| .T05 | H&R Block | Gegevensbestanden | TaxCut 2005 Tax Return Data | TaxCut 2006 | H&R Block |
| .T06 | H&R Block | Gegevensbestanden | TaxCut 2006 Tax Return File | TaxCut 2006 | H&R Block |
| .T10 | H&R Block | Gegevensbestanden | At Home 2010 Tax Return | H&R Block Tax Software | H&R Block |
| .T2 | RM Education | Gegevensbestanden | Textease 2000 File | Textease 2000 | RM Education |
| .T2K | Basement.nl | Gegevensbestanden | Teach2000 Document | Teach2000 | Basement.nl |
| .T2KS | Basement.nl | Gegevensbestanden | Teach2000 Exam Results File | Teach2000 | Basement.nl |
| .T2KT | Basement.nl | Gegevensbestanden | Teach2000 Exam File | Teach2000 | Basement.nl |
| .T2L | Elevenworks LLC | Gegevensbestanden | TouchDraw Library | TouchDraw | Elevenworks LLC |
| .T32 | Symantec Corporation | Gegevensbestanden | Drive Image 5 File | PowerQuest Drive Image | Symantec Corporation |
| .T99 | H&R Block | Gegevensbestanden | TaxCut Data File | TaxCut 2006 | H&R Block |
| .TA0 | TaxAct | Gegevensbestanden | TaxAct 2014 Tax Return File | TaxAct | TaxAct |
| .TA1 | TaxAct | Gegevensbestanden | TaxACT 2001 Tax Form File | TaxAct | TaxAct |
| .TA2 | TaxAct | Gegevensbestanden | TaxAct 2014 Tax Return File | TaxAct | TaxAct |
| .TA3 | TaxAct | Gegevensbestanden | TaxAct 2014 Tax Return File | TaxAct | TaxAct |
| .TA4 | TaxAct | Gegevensbestanden | TaxAct 2014 Tax Return File | TaxAct | TaxAct |
| .TA5 | TaxAct | Gegevensbestanden | TaxAct 2015 Tax Return File | TaxAct | TaxAct |
| .TAB | Microsoft Corporation | Gegevensbestanden | Tab Separated Data File | Microsoft Excel | Microsoft Corporation |
| .TABLE1 | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .TABLES | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .TAC | Parmerlee, Inc. | Gegevensbestanden | ActiCalc Data File | ActiCalc | Parmerlee, Inc. |
| .TAG | Data Access Worldwide | Gegevensbestanden | DataFlex Data File | DataFlex | Data Access Worldwide |
| .TAH | Borland | Gegevensbestanden | Turbo Assembler Help Data File | Turbo Assembler | Borland |
| .TAI | NVIDIA | Gegevensbestanden | NVIDIA Texture Atlas Creation Tool Texture Data | Texture Atlas Tools | NVIDIA |
| .TAL | Adobe Systems Incorporated | Gegevensbestanden | Adobe TypeAlign Text Illustration File | Adobe TypeAlign | Adobe Systems Incorporated |
| .TALK | Unknown Developer | Gegevensbestanden | Text To Speech File | Unknown Software | Unknown Developer |
| .TALK2 | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .TAR | Jean-loup Gailly and Mark Adler | Gegevensbestanden | Consolidated Unix File Archive | 7-Zip | Igor Pavlov |
| .TASK | Hewlett-Packard | Gegevensbestanden | HP Printer Utility Task Plugin File | HP Printer Utility (for Mac) | Hewlett-Packard |
| .TAX | Intuit, Inc. | Gegevensbestanden | TurboTax Tax Return | Intuit Quicken | Quicken |
| .TAX2008 | Intuit, Inc. | Gegevensbestanden | TurboTax 2008 Tax Return | Intuit TurboTax | Intuit, Inc. |
| .TAX2009 | Intuit, Inc. | Gegevensbestanden | TurboTax 2009 Tax Return | Intuit TurboTax | Intuit, Inc. |
| .TAX2010 | Intuit, Inc. | Gegevensbestanden | TurboTax 2010 Tax Return | Intuit TurboTax | Intuit, Inc. |
| .TAX2011 | Intuit, Inc. | Gegevensbestanden | TurboTax 2011 Tax Return | Intuit TurboTax | Intuit, Inc. |
| .TAX2012 | Intuit, Inc. | Gegevensbestanden | TurboTax 2012 Tax Return | Intuit TurboTax | Intuit, Inc. |
| .TAX2013 | Intuit, Inc. | Gegevensbestanden | TurboTax 2013 Tax Return | Intuit TurboTax | Intuit, Inc. |
| .TAX2015 | Intuit, Inc. | Gegevensbestanden | TurboTax 2015 Tax Return | Intuit TurboTax | Intuit, Inc. |
| .TAX2016 | Intuit, Inc. | Gegevensbestanden | TurboTax 2016 Tax Return | Intuit TurboTax | Intuit, Inc. |
| .TB | Tabbery | Gegevensbestanden | Tabbery Tab File | Tabbery | Tabbery |
| .TB3 | Intel Corporation | Gegevensbestanden | Intel VTune Performance Monitor File | Intel VTune | Intel Corporation |
| .TBA | Inmagic | Gegevensbestanden | DB/Text Database Primary Textbase Definition File | DB/TextWorks | Inmagic |
| .TBB | Microsoft Corporation | Gegevensbestanden | Microsoft Office Toolbar Button | Microsoft Office | Microsoft Corporation |
| .TBC | Psygnosis | Gegevensbestanden | Formula One 2001 Season 01 Vehicles Data | Formula One 2001 | Psygnosis |
| .TBF | Trellian Software | Gegevensbestanden | Trellian Button Factory File | Trellian Button Factory | Trellian Software |
| .TBH | PowerBASIC, Inc. | Gegevensbestanden | Turbo Basic Help File | PowerBASIC | PowerBASIC, Inc. |
| .TBI | Electronic Arts | Gegevensbestanden | FIFA 2001 Game Data | FIFA 2001 | EA Sports |
| .TBK | SumTotal Systems | Gegevensbestanden | ToolBook Project File | ToolBook | SumTotal Systems |
| .TBL | Blizzard Entertainment Inc. | Gegevensbestanden | StarCraft Information Table | StarCraft | Blizzard Entertainment Inc. |
| .TBT | ARRIS | Gegevensbestanden | Timbuktu Pro Remote Control Software File Format | Timbuktu | ARRIS |
| .TBV | Brain Innovation | Gegevensbestanden | Turbo-BrainVoyager Data File | Turbo-BrainVoyager | Brain Innovation |
| .TBX | Simple DirectMedia Layer (SDL) | Gegevensbestanden | SDL Trados Studio Glossary Data | Sublime Text | Sublime HQ Pty Ltd |
| .TC | TrueCrypt | Gegevensbestanden | TrueCrypt Volume | TrueCrypt | TrueCrypt |
| .TCC | Pro Systems | Gegevensbestanden | TimeCalc Classic Data File | TimeCalc Classic | Pro Systems |
| .TCH | Micro Focus International plc | Gegevensbestanden | Borland C++ Help Document | Borland C++ | Micro Focus International plc |
| .TCL | Open Source | Gegevensbestanden | Tcl Script | MacroMates TextMate | MacroMates |
| .TCO | Unknown Developer | Gegevensbestanden | T9000 Object Module | Unknown Software | Unknown Developer |
| .TCX | Garmin | Gegevensbestanden | Training Center Database File | Garmin Connect | Garmin |
| .TDB | Google | Gegevensbestanden | Android Thumbnail Cache | Google Android | Google |
| .TDD | MRDC Software | Gegevensbestanden | Tables Direct Template | Tables Direct | MRDC Software |
| .TDF | DVD Copy | Gegevensbestanden | Title Definition Format File | DVD X Copy | DVD Copy |
| .TDG | Tom Lachecki | Gegevensbestanden | Tree Diagram Generator Document | Tree Diagram Generator | Tom Lachecki |
| .TDH | Borland | Gegevensbestanden | Turbo Debugger Help File | Borland Turbo Debugger | Borland |
| .TDK | Borland | Gegevensbestanden | Borland Turbo Debugger Keystroke Recording File | Borland Turbo Debugger | Borland |
| .TDN | SoftArtStudio | Gegevensbestanden | TreeDBNotes Database | TreeDBNotes | SoftArtStudio |
| .TDR | PO KSI | Gegevensbestanden | ArVid Tape Backup | ArVid | PO KSI |
| .TDT | Sony | Gegevensbestanden | AVCHD Thumbnail File | Unknown Software | Unknown Developer |
| .TDX | D-TEG Security Co. | Gegevensbestanden | D-TEG CCTV Video Information File | D-TEG MRX PC Client | D-TEG Security Co. |
| .TEASERS2 | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .TEC | SIL International | Gegevensbestanden | TECkit Compiled Mapping File | TECkit | SIL International |
| .TECH | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .TEF | tabledit.com | Gegevensbestanden | TablEdit Tablature | TuxGuitar | Julian Gabriel Casadesus and Others |
| .TEK | Unknown Developer | Gegevensbestanden | ASITIC Technology File | ASITIC | Unknown Developer |
| .TELL | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .TEM | E J Software | Gegevensbestanden | Badge Designer 2000 Data | Badge Designer 2000 | E J Software |
| .TER | Planetside Software | Gegevensbestanden | Terragen Terrain File | Planetside Software Terragen | Planetside Software |
| .TEST | Unknown Developer | Gegevensbestanden | Testing File | Unknown Software | Unknown Developer |
| .TESTING | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .TET | RM Education | Gegevensbestanden | Textease CT Template | Textease Studio | RM Education |
| .TEXI | GNU Project | Gegevensbestanden | TEXinfo File Format | TexInfo | GNU Project |
| .TFA | Tree Software and Consulting Inc. | Gegevensbestanden | TreeSoft CashFlow Analysis Data File | treeSoft CashFlow Analysis (tree.fa.exe) | treeSoft |
| .TFD | Various Developers | Gegevensbestanden | Tape Format Requirements Document | BAE Systems VITec PC | BAE Systems |
| .TFH | Borland | Gegevensbestanden | Turbo Profiler Help Data File | Turbo Profiler | Borland |
| .TFM | Jonathan Kew and Stefan Löffler | Gegevensbestanden | TeX Font Metric File | MiKTeX | Christian Schenk |
| .TFR | LucasArts Entertainment Company, LLC | Gegevensbestanden | TIE Fighter Pilot File | Star Wars: TIE Fighter | LucasArts Entertainment Company, LLC |
| .TFS | Borland | Gegevensbestanden | Turbo Profiler Statistical Information Data | Turbo Profiler | Borland |
| .TFT | FormatBlue Software | Gegevensbestanden | Text Formatter Plus File | Text Formatter Plus | FormatBlue Software |
| .TFU | Two notes Audio Engineering | Gegevensbestanden | Torpedo Live Firmware Update | Torpedo Live | Two notes Audio Engineering |
| .TFW | ESRI | Gegevensbestanden | World File For TIFF | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .TFX | Avid Technology | Gegevensbestanden | Pro Tools Eleven Rack Plugin Preset File | Avid Pro Tools | Avid Technology |
| .TGD | Planetside Software | Gegevensbestanden | Terragen Project File | Planetside Software Terragen | Planetside Software |
| .TGF | Unknown Developer | Gegevensbestanden | Trivial Graph Format File | Wolfram Research Mathematica | Wolfram Research |
| .TGS | GeneStudio, Inc. | Gegevensbestanden | GSTree Phylogenetic Tree Information Data | GeneStudio Pro | GeneStudio, Inc. |
| .TGT | Corel | Gegevensbestanden | Corel Custom Data | CorelDRAW Graphics Suite | Corel |
| .TH | Open Source | Gegevensbestanden | Therion Data File | Therion | Open Source |
| .THR | PTC | Gegevensbestanden | Pro/ENGINEER File | Pro/ENGINEER | PTC |
| .THS | Corel | Gegevensbestanden | Corel WordPerfect Thesaurus Dictionary | Corel WordPerfect | Corel |
| .TIA | Siemens AG | Gegevensbestanden | Siemens TIA Portal Data | TIA Portal | Siemens AG |
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