HFSS: project file format

Hi all,

I am trying to generate automatically HFSS project, starting from an IGS, STP or STL geometry file.

The point is that if I import such a file type inside HFSS, when I save the project and I open the .hff file, the geometry of the imported file is there but with a complete different format file, which I guess is the HFSS way to describe the geometry.

Does anybody know how this works? Is there a parser from a standard file (stp, igs, stl) to the format that HFSS uses?

Many thanks,

Jorge