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| Name | STEP | Softimage XSI 3D Image |
| File extension | .stp, .step | .xsi |
| Original software | XSI | |
| Binary | ■ | ■ |
| ASCII | ■ | |
| Polygonal | ■ | |
| NURBS | ■ | |
| Solids | ||
| Smoothing groups | ■ | ■ |
| Textures, materials | ■ | |
| Developer/Owner | ISO | |
| Description | ||
| Specification | Download PDF | |
| Format features | The basic format of the transfer surfaces between CAD-systems. See also IGES | |
| Viewing software | Delcam Exchange 2012 (free), eDrawings (free) | XSI |