I THINK YOU ALL ARE MAKING A BIG CONFUSION ABOUT THIS
SUBJET.
STEP AND IGES FILES ARE GENERIC TRANSLATION FILES, AND ARE
THE ONLY TRANSLATION FILES THAT ALL CAD SYSTEMS CAN READ
WITHOUT ANY ADITIONAL LICENCES.
IF YOU OPEN A STEP FILE WITH PROE, IT DOESN'T MATHER WHAT
VERSION, IT BECOMES A PROE FILE, THAN YOU CAN MAKE WHAT
EVER YOU WANT WITH IT.