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| Name | NX Part/Assembly File | Softimage XSI 3D Image | 
| File extension | .prt | .xsi | 
| Original software | NX (Unigraphics) | XSI | 
| Binary | ■ | ■ | 
| ASCII | ||
| Polygonal | ■ | ■ | 
| NURBS | ■ | |
| Solids | ■ | |
| Smoothing groups | ■ | ■ | 
| Textures, materials | ■ | ■ | 
| Developer/Owner | Siemens | |
| Description | ||
| Specification | ||
| Format features | ||
| Viewing software | Delcam Exchange 2012 (free) | XSI |