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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .T3D | Epic Games | Settings Files | Unreal Engine 3D Object File | Unreal Tournament | Epic Games |
| .T3M | Electric Rain | Settings Files | Swift 3D Material File | Swift 3D | Electric Rain |
| .TAM | TameDOS | Settings Files | Tame Program Settings | Tame | TameDOS |
| .TB | Tabbery | Settings Files | Tabbery Tab File | Tabbery | Tabbery |
| .TBB | Microsoft Corporation | Settings Files | Microsoft Office Toolbar Button | Microsoft Office | Microsoft Corporation |
| .TBE | Pegasys | Settings Files | TMPGEnc List | TMPGEnc | Pegasys |
| .TBM | Nabi Studios | Settings Files | Toribash Mod File | Toribash | Nabi Studios |
| .TBR | Adobe Systems Incorporated | Settings Files | Adobe Photoshop Custom Toolbar Preset | Adobe Photoshop | Adobe Systems Incorporated |
| .TDF | DVD Copy | Settings Files | Title Definition Format File | DVD X Copy | DVD Copy |
| .TEE | Steema Software | Settings Files | TeeChart Template | Steema TeeChart | Steema Software |
| .TESTRUNCONFIG | Microsoft Corporation | Settings Files | Microsoft Visual Studio Test Run Configuration File | Microsoft Visual Studio | Microsoft Corporation |
| .TF | Borland | Settings Files | Turbo Profiler Configuration | Turbo Profiler | Borland |
| .TFA | Tree Software and Consulting Inc. | Settings Files | TreeSoft CashFlow Analysis Data File | treeSoft CashFlow Analysis (tree.fa.exe) | treeSoft |
| .TFD | Various Developers | Settings Files | Tape Format Requirements Document | BAE Systems VITec PC | BAE Systems |
| .TFX | Avid Technology | Settings Files | Pro Tools Eleven Rack Plugin Preset File | Avid Pro Tools | Avid Technology |
| .TGB | TheGreenBow | Settings Files | IPSec VPN Client VPN Configuration File | IPSec VPN Client | TheGreenBow |
| .THE | Microsoft Corporation | Settings Files | Microsoft Plus! Theme File | Microsoft Plus! | Microsoft Corporation |
| .THEME | Microsoft Corporation | Settings Files | Microsoft Plus! Desktop Theme | Microsoft Windows | Microsoft Corporation |
| .THEMEPACK | Microsoft Corporation | Settings Files | Microsoft Windows 7 Theme Pack | Microsoft Windows 7 | Microsoft Corporation |
| .THM | Sony | Settings Files | Sony Ericsson Mobile Phone Theme File | Sony Ericsson Theme Creator | Sony Mobile Communications |
| .THMX | Microsoft Corporation | Settings Files | Microsoft Office 2007 Theme File | Microsoft Excel | Microsoft Corporation |
| .TIM | Sierra Entertainment | Settings Files | The Incredible Machine Level | The Incredible Machine | Sierra Entertainment |
| .TLL | LG Electronics | Settings Files | LG TV Link-Loader File | ChanSort | Open Source |
| .TLO | IBM | Settings Files | SPSS TableLooks File | IBM SPSS | IBM |
| .TMS | Telemate | Settings Files | Telemate Script | Telemate | Telemate |
| .TOP | KTH Royal Institute of Technology | Settings Files | Gromacs Topology File | Gromacs | KTH Royal Institute of Technology |
| .TP | SnapStream Media | Settings Files | Beyond TV Transport Stream File | CyberLink PowerDVD | CyberLink |
| .TPF | IBM | Settings Files | SPSS Text Wizard Document | IBM SPSS | IBM |
| .TPL | Unknown Developer | Settings Files | Document Template | NoteTab | Fookes Software |
| .TPP | Ternion Corporation | Settings Files | FLAMES GUI Template File | FLAMES | Ternion Corporation |
| .TR | Yadabyte | Settings Files | TomeRaider 2 eBook File | TomeRaider | Yadabyte |
| .TRW | Borland | Settings Files | Borland Turbo Debugger For Windows Session-State Settings | Borland Turbo Debugger | Borland |
| .TRX | Microsoft Corporation | Settings Files | Visual Studio Test Results File | Microsoft Visual Studio | Microsoft Corporation |
| .TSI | Native Instruments | Settings Files | Traktor Settings File | Traktor | Native Instruments |
| .TSK | Microsoft Corporation | Settings Files | Pocket PC Skin | Microsoft ActiveSync | Microsoft Corporation |
| .TSM | Beckhoff | Settings Files | TwinCAT System Manager Configuration File | TwinCat System Manager | Beckhoff |
| .TSP | Inmatrix Media Solutions | Settings Files | Digital TV DVR Recording | Zoom Player | Inmatrix Media Solutions |
| .TST | Measurement Computing | Settings Files | TestPoint Test File | Measurement Computing TestPoint | Measurement Computing |
| .TSW | National Instruments | Settings Files | NI TestStand Workspace | NI TestStand | National Instruments |
| .TSZ | Cerulean Studios | Settings Files | Trillian Skin File | Cerulean Studios Trillian | Cerulean Studios |
| .TV | Corel | Settings Files | Corel Paradox Table View Settings | Corel Paradox | Corel |
| .TVC | IMSI/Design, LLC | Settings Files | Turbo View & Convert Batch Presets File | IMSI TurboCAD Deluxe | Redway3d and others |
| .TVP | NVIDIA | Settings Files | NVIDIA Graphic Card Update File | NVIDIA Graphics Driver | NVIDIA |
| .TWC | Tripwire, Inc. | Settings Files | Tripwire Configuration Data File | Tripwire Enterprise | Tripwire, Inc. |
| .TWN | Unknown Developer | Settings Files | Scanner Settings File | Unknown Software | Unknown Developer |
| .TWS | Helios Software Solutions | Settings Files | TextPad Workspace | TextPad | Helios Software Solutions |
| .TXM | CFP Software Limited | Settings Files | CFPwinMan Document File | CFPwinMan | CFP Software Limited |
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