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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .T2 | RM Education | Graphic Files | Textease 2000 File | Textease 2000 | RM Education |
| .T2K | Basement.nl | Graphic Files | Teach2000 Document | Teach2000 | Basement.nl |
| .T2W | Borland | Graphic Files | NTgraph Turbo Pascal File | Turbo Pascal | Embarcadero Technologies |
| .TAP | Various Developers | Graphic Files | Commodore 64 Cassette Tape Image | Fuse | Open Source |
| .TBF | Trellian Software | Graphic Files | Trellian Button Factory File | Trellian Button Factory | Trellian Software |
| .TBT | ARRIS | Graphic Files | Timbuktu Pro Remote Control Software File Format | Timbuktu | ARRIS |
| .TCA | Iota Software | Graphic Files | The Complete Animator Animation | The Complete Animator | Iota Software |
| .TDI | Toshiba Corporation | Graphic Files | Toshiba Disc Creator Image | Toshiba Disc Creator | Toshiba Corporation |
| .TEI | Image Systems | Graphic Files | TrackEye Image Sequence File | TrackEye | Image Systems |
| .TER | Planetside Software | Graphic Files | Terragen Terrain File | Planetside Software Terragen | Planetside Software |
| .TF | Borland | Graphic Files | Turbo Profiler Configuration | Turbo Profiler | Borland |
| .TFF | Roland Kraft, Josef Kauer, Nikolaus Meier | Graphic Files | IDOLON Tagged File Format | IDOLON | Roland Kraft, Josef Kauer, Nikolaus Meier |
| .THB | COMIRAM Innovation | Graphic Files | KinuPix Skin | KinuPix | COMIRAM Innovation |
| .THL | Individual Software Inc. | Graphic Files | Total 3D Home Design File | Total 3D Home Design Deluxe | Individual Software Inc. |
| .TR5 | Onyx Computing | Graphic Files | OnyxTree Professional Data | OnyxTREE BROADLEAF | Onyx Computing |
| .TRI | Singular Inversions | Graphic Files | FaceGen Polygonal Model File | The Elder Scrolls IV: Oblivion | Bethesda Softworks |
| .TSB | 3dMD | Graphic Files | 3dMD Or 3Q Viewer 3D Image | 3dMD | 3dMD |
| .TUD | Cerious Software | Graphic Files | ThumbsPlus Graphics File | ThumbsPlus | Cerious Software |
| .TUO | Cerious Software | Graphic Files | ThumbsPlus Viewer Graphics | ThumbsPlus | Cerious Software |
| .TXM | CFP Software Limited | Graphic Files | CFPwinMan Document File | CFPwinMan | CFP Software Limited |
| .TXS | Delphi Softwares | Graphic Files | Beast (Trojan Horse) Data File | Beast (Trojan Horse) | Delphi Softwares |
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