How to convert cadpart to stp file

Everything points to the fact that no cadpart to stp conversion possible. Nonetheless, it might be possible that you were in fact looking for a way to convert CATIA part designs (.catpart) to ISO STEP product data format (.stp). In this case please check out the  catpart to stp conversion entry.

In a word, direct cadpart to stp conversion is not possible.
So don't expect any so-called cadpart to stp converter or cadpart to stp free online conversion tool available.

Open CADPART file    Open STP file