| uxp | IGOR Pro Unpacked Experiment File |
| uxt | IGOR Pro Unpacked Experiment Template File |
| uyl | User Screen Editor Dictionary Data |
| uz1 | JB BAHN Scenery Archive |
| uz2 | JB BAHN Scenery Archive |
| uz4 | JB BAHN Scenery Archive |
| uzg | JB BAHN Scenery Archive |
| uzr | iModeller 3D UZR Model |
| v | Vivid 2.0 Input File |
| v00 | Kretz 3D Ultrasound Image |
| v01 | Genesis 2000 Data |
| v11 | ESR v11 Data |
| v16 | BrainVoyager QX MRI 16bit Data |
| v1b | Digital Tachograph Data |
| v2 | Windows Live Messenger Data |
| v2b | TI Voyage 200 Backup Data |
| v2c | WellSight Systems HASP SRM License Information Data |
| v2d | VersaCAD Data |
| v2e | TI Voyage 200 Expression |
| v2f | TI Voyage 200 Function |
| v2l | TI Voyage 200 List Data |
| v2m | TI Voyage 200 Matrix Data |
| v2q | TI Voyage 200 Certificate Data |
| v2r | TI Voyage 200 Lab Reports Data |
| v2s | TI Voyage 200 String Data |
| v2t | TI Voyage 200 Text |
| v2x | TI Voyage 200 Macro Data |
| v2y | TI Voyage 200 Application Variables Data |
| v32 | Iconics TrendWorX32 File |
| v3d | PTV VISSIM 3D Model |
| v3d | Visual3D.NET Data |
| v3dassets | Visual3D.NET Assets Data |
| v3dm | PTV VISSIM 3D Model |
| v3dscene | Visual3D.NET Scene Data |
| v3m | Vector Art 3D Machinist Data |