Hi Fran6, I tested opening your file in both Rhino and ViaCAD and neither of them see the colors either. I think this is because your file is a single solid with color information attached to different faces in it rather than the more common configuration of having color information only attached at the "whole object" level.

That type of coloring is not commonly supported in most CAD programs and this is the first time someone has sent me a STEP file structured like that. I'll see if it is possible for MoI to support it.

- Michael

Hi Fran6, I've been able to update the STEP import and export for the next v4 beta to support individually colored faces inside of a single solid. So in the next beta your file above should import with colors intact.

- Michael