| urf | ProWorx NXT User Configurable Register Editor Data |
| urp | Universal Report Document |
| urr | Uniface Runtime Repository |
| urs | Ur Signature |
| ush | Crestron SIMPL CNX Compile |
| uskn | KSDev ThemeEngine Theme |
| usl | ProWorx NXT USL Loadable |
| uxo | RapidPLUS XML User Defined Object |
| v | Verilog HDL Source |
| v3s | Visual3D Pipeline |
| v4p | VVVV Patchlet |
| vala | Vala Source Code File |
| vbg | Visual Basic Project Group |
| vbhtml | Razor VB Web Page |
| vbi | IntelliCAD VBA Script |
| vbl | Visual Basic Control Licensing File |
| vbr | Remote Automation RegistrationFile |
| vbscript | Visual Basic Script |
| vbw | Visual Basic Workspace |
| vbx | Visual Basic Custom Control |
| vbz | Visual Basic Wizard Launch File |
| vch | Vocola Include File |
| vcl | Vocola Source Code |
| vct | Visual FoxPro Class Library Memo |
| vcx | Visual FoxPro Class Library |
| vdm | VDM Source Code |
| vdt | VersaPro Variable Declaration Table |
| ved | Visionaire Studio Data |
| vert | QT Vertex Shader |
| vf | Xilinx ISE Verilog Source Code |
