You can set export options for SolidWorks part or assembly documents exported as STEP files.
To set the STEP export options:
Click File > Save As
Select STEP in Type, and then click Options.
Make your selections from the options described below, and then click OK.
Click Save to export the document.
Output as
Volume/Surface Geometry
Allows you to export geometry as volume or polygon bodies.
3D Curves
Allows you to export density and polygon bodies as wireframe entities. All 3D curves (composite curves, 3D wireframes, imported curves, etc.) are also saved.
Export sketch entities
(available only with selected 3D curves). All objects in 3D Curves, as well as all 2D and 3D sketches that exist in the document, are exported.
Define STEP configuration data
(available only when exporting to STEP AP203 (*.step) files). Displays the STEP Configuration Data dialog box for export. If you select 3D Curves or Export Sketch Entities, you can only open STEP files that are exported in SolidWorks 2001Plus or later.
If you select Set STEP Configuration Data, the STEP Configuration Data for Export dialog box appears.
Because you cannot group sketch items into a STEP file, the following results are achieved when you open the file in SolidWorks:
All lines and splines are imported into a single 3D sketch.
All circles, ellipses, and parabolas are imported into individual 2D sketches.
Exit coordinate system
Select a coordinate system for export. If you select the default, no transformation matrix is applied.
Export face/edge properties
Exports the properties of faces and edges. Disable this option to improve export performance.
Splitting periodic faces
Divides periodic faces, such as cylindrical faces, into two. Splitting a periodic face can help improve export quality, but may affect performance.
@gt22: Your text talks about export options and not about import. My export options are well set since my other customers don't have this problem (this client didn't have it either before changing versions)
@Tomalam: I guess it's a Creo capture. Would you have the same with the import options rather than the export options. It will allow me to tell my client what to tick to get volume.
@.PL: interesting link indeed. we learn that Creo can open native solidworks, which is good news for me.