| .tja |
Taikojiro Song Map File |
| .tha |
Windows Thai Noise-Words List File |
| .tyimport |
Typinator Set Import File |
| .ta |
Sony Firmware File |
| .uue |
Uuencoded File |
| .uu |
Uuencoded File |
| .url |
Internet Shortcut |
| .utf8 |
Unicode UTF8-Encoded Text Document |
| .utxt |
Unicode Text File |
| .udl |
Microsoft Universal Data Link File |
| .upr |
Fractal Parameters File |
| .ust |
UTAU Sequence Text File |
| .uvw |
UVW Coordinates File |
| .user |
Visual Studio Project User Options File |
| .udf |
Universal Disk Format File |
| .unt |
AutoCAD Unit Definition File |
| .upd |
Program Update Information |
| .updatr |
iConomy Update File |
| .ut8 |
Ghost Master Language File |
| .vb |
Visual Basic Project Item File |
| .vcd |
Virtual CD |
| .vcf |
vCard File |
| .vbs |
VBScript File |
| .vdproj |
Visual Studio Setup and Deployment Project |