What is the best file type to use when exporting parts for use in other 3D Modeling programs. I'm trying to send a colleague a part converted to a STEP file. That colleague can open it, but they complain that all of the features (revolve, extrude, fillet, etc) are missing as his program simply imports the part as a one-bodied solid. Is there any way to export a part for use in a different program that maintains the individual features/methods used to create the part?