| File Format | Extension | Open | Insert From File | Save As | Note |
| think3 3D Model | e3 | YES | YES | YES | |
| think3 2D Drawing | e2 | YES | YES | YES | |
| GBG DraftMaker | d | YES | YES | YES | Load: see GBG DraftMaker to think3 conversion table Save: Drawings only — for special plotting using GBPLO |
| ASCII Points | pt | YES | YES | YES | |
| IGES | igs | YES | YES | YES | See Conversion to and from the IGES format |
| VDA | vda | YES | YES | YES | |
| DXF File — AutoCAD® DXF | dxf | YES | YES | YES | See Conversion to and from AutoCAD formats |
| DWG File — AutoCAD® Drawing | dwg | YES | YES | YES | See Conversion to and from AutoCAD formats |
| think3 Neutral Format | gkd | YES | YES | YES | |
| STEP Format | stp, step | YES | YES | YES | See Conversion to and from the STEP format |
| STL Format | stl | YES | YES | YES | See Conversion to and from the STL format |
| 3MF Format | 3mf | YES | YES | YES | See Conversion to and from the 3MF format |
| PLY Format | ply | YES | YES | YES | See Conversion to and from the PLY format |
| VRML Format | wrl | YES | See Converters | ||
| Wavefront Format | obj | YES | YES | YES | See Conversion to and from the Wavefront format |
| IRIS Inventor™ Format | iv | YES | See Converters | ||
| XGL Format | xgl | YES | See Converters | ||
| PDF Format | YES | See Conversion to the PDF format |