| txt | Atari Jaguar Text Segment Data |
| txtdt | DVD TEXT Data File |
| txtrpt | ATCLite Text Site Report |
| txtrpt | CommScope Teletilt Control System Text Site Report File |
| txtsrc | eMule Source Data |
| txtx | MyWinLocker Encrypted Text Data |
| txu | cncCUT Program Text Data |
| txv | RapidReader TextVision Data |
| txx | DataPerfect Text Storage |
| txx | Insight Segmentation and Registration Toolkit TXX Data |
| tx_ | Compressed TXT File |
| tydsp | eXtendable Wad Editor TYDSP Data |
| tyimport | Typinator Set Import Data |
| tym | Adobe Pagemaker Timestamp Data |
| tyset | Typinator Set File |
| tza | TZ Medical Aera-CT Data |
| tzd | Netscape Communicator Locale Data |
| tzl | SketchUp Custom Location Data |
| tzt | CP/M Video Mode Data |
| tzx | Tanzzle Graphic Object |
| tzx | ZX Spectrum Emulator Tape Data TZX |
| u | Nitpicker IP Flow Data |
| u | Unreal Engine Data |
| u00 | PC64 User Container Data |
| u01 | Barudan Embroidery Data |
| u08 | UFile 2008 Tax Return Data |
| u10 | UFile 2010 Tax Return Data |
| u11 | UFile 2011 Tax Return Data |
| u12 | UFile 2012 Tax Return Data |
| u14 | Embird Embroidery Data |
