| Endung | Registry-Eintrag | Anwendung (Standard) |
| .tar | compressed WinRAR | Winrar |
| .TAZ | WinZip | Winzip |
| .tba | TextureBatcher.Document | |
| .tbz | WinRAR | Winrar |
| .tbz2 | WinRAR | Winrar |
| .tcs | tcsdatei | |
| .TEX | Corel.Texture | Corel Texture |
| .text | text | MICROSOFT Notepad |
| .tga | Photoshop.TGAdatei | ADOBE Photoshop |
| .tgz | compressed WinRAR | Winrar |
| .theme | PLUS! Theme datei | MICROSOFT PLUS! |
| .tic | Ticker.Document | |
| .tif | image/tiff | MICROSOFT Internet Explorer |
| .tiff | image/tiff | MICROSOFT Internet Explorer |
| .tpl | tpl_auto_datei | |
| .tsv | text | MICROSOFT Notepad |
| .ttc | ttcdatei | |
| .ttf | true Type Schriftarten datei | |
| .ttx | Teletext | |
| .tuw | TUWdatei | |
| .txt | txtdatei | MICROSOFT Notepad |
| .TZ | WinZip | Winzip |
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