| .T1 | XnSoft | Raster Image Files | Male MRI Image Format | XnView MP | XnSoft |
| .TAAC | Sun Microsystems | Raster Image Files | Sun TAAC Image | XnView MP | XnSoft |
| .TBN | Open Source | Raster Image Files | Kodi Thumbnail Image | Kodi | Open Source |
| .TDP | Serif | Raster Image Files | Sherif DrawPlus Thumbnail File | Serif WebPlus | Serif |
| .TEX | Open Source | Raster Image Files | LaTeX Source Document | gVim | Open Source |
| .TG4 | Bentley Systems | Raster Image Files | Tiled Group 4 Raster Image File | MicroStation | Bentley Systems |
| .TGA | Avid Technology | Raster Image Files | Targa Graphic | Adobe Illustrator CC | Adobe Systems Incorporated |
| .THM | Sony | Raster Image Files | Sony Ericsson Mobile Phone Theme File | Sony Ericsson Theme Creator | Sony Mobile Communications |
| .THUMB | Jalbum AB | Raster Image Files | JAlbum Thumbnail File | JAlbum | Jalbum AB |
| .TIF | XnSoft | Raster Image Files | Tagged Image File Format | Adobe Illustrator CC | Adobe Systems Incorporated |
| .TIFF | XnSoft | Raster Image Files | Tagged Image File Format | Adobe Illustrator CC | Adobe Systems Incorporated |
| .TILE | XnSoft | Raster Image Files | Eclipse Image | Unknown Software | Unknown Developer |
| .TIM | Sierra Entertainment | Raster Image Files | The Incredible Machine Level | The Incredible Machine | Sierra Entertainment |
| .TN1 | Atari Corporation | Raster Image Files | Tiny Low Resolution Image | Graphics Converter Pro | Newera Software Technology, Inc. |
| .TN2 | Atari Corporation | Raster Image Files | Tiny Medium Resolution Image | XnView MP | XnSoft |
| .TN3 | Atari Corporation | Raster Image Files | Tiny High Resolution Image | XnView MP | XnSoft |
| .TNY | Atari Corporation | Raster Image Files | Atari Tiny Image | Graphics Converter Pro | Newera Software Technology, Inc. |
| .TPF | IBM | Raster Image Files | SPSS Text Wizard Document | IBM SPSS | IBM |
| .TPI | Thomson Reuters Corporation | Raster Image Files | EDIUS Plugin File | Thomson EDIUS | Grass Valley |
| .TPS | TiePie engineering | Raster Image Files | Multi Channel Measurement File | Multi Channel | TiePie engineering |
| .TRIF | Tiling Task Group (TTG) | Raster Image Files | Tiled Raster Interchange Format | Unknown Software | Unknown Developer |
| .TRP | VSO Software | Raster Image Files | MPEG-2 HD Video Transport Stream | CyberLink PowerDVD | CyberLink |
| .TUB | Corel | Raster Image Files | PaintShop Pro Picture Tube | GIMP | The GIMP Development Team |
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