dj, thank you so much. I have been googling for a couple of days but have yet to see some of the sites that
show up on your post, this old brain has difficulty in sorting out suitable search descriptors, but the "convert"
element in yours seems to have done the trick.
I shall now go and spend time having a look, i hope some can be used in Linux.
You're welcome. Normally, I would recommend something in our repositories. But, there doesn't seem to be anything related to converting CAD formats. And everything I saw on the web was a pay service to do the conversion, or a pay for proprietary program. Good luck.