Yes, I also get that in GM16, just ignore it as per what sedicla said. You should be able to drag .RSO/.RGE files from a folder into GM, or when you go to open a file from GM it should have all the A*T*D*I options available including .RSO/.RGE. If it is is still giving you problems, try GM 16 32 bit (it wont work in any 64 bit GM).
All credit to sedicla for this good work!
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