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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .TEC | SIL International | Uncommon Files | TECkit Compiled Mapping File | TECO | Interscape |
| .TEX | Open Source | Text Files | LaTeX Source Document | Skim | Interscape |
| .TGZ | Various Developers | Compressed Files | Gzipped Tar File | ZDevs ZArchiver | Interscape |
| .THEME | Microsoft Corporation | System Files | Microsoft Plus! Desktop Theme | GNOME Desktop | Interscape |
| .TKL | Interscape | Data Files | Takeoff Live PDF Working Data | Takeoff Live | Interscape |
| .TOC | Sony | Audio Files | Sony PlayStation Portable (PSP) Audio File | Exact Audio Copy for PSP Edition | Interscape |
| .TPX | DeLorme | GIS Files | DeLorme Topo Project File | Topo North America | Interscape |
| .TRA | Interscape | Data Files | WinTrack Railroad Track Text File | WinTrack | Interscape |
| .TRP | VSO Software | Video Files | MPEG-2 HD Video Transport Stream | EggPaint | Interscape |
| .TRS | Interscape | Data Files | WinTrack Railroad Track Text File | WinTrack | Interscape |
| .TRX | Microsoft Corporation | Developer Files | Visual Studio Test Results File | CyberCash WebAuthorize | Interscape |
| .TTT | Interscape | Data Files | TestTrack Pro Database File | TestTrack Pro | Interscape |
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