ok, once more for the ones in the back.
chatGPT is a moron.
if you check the website, at the bottom you can search for terms, and searching for 3dm or thino only brings up a thread from 2019 where people ask for the same as you do.
on the other hand, a GOOGLE search gives you this
Rhino reads and writes SU files up to SU19 SU21. so if you want a rhino file, open the SU file in rhino, and save it as 3dm
you also find this video
