I ran the patch and copied the OVER101.m3o file to my M3Data folder.
No joy. Still crashes at the point shown.

I get a hard crash when I try to go down the stairs from the 'horn' house. Is there another path I can take? Originally, myst3 would not run. Following the wiki I tried to find the "OVER101.m3o" file, but couldn't. (Not on original discs.) So I just created an empty file by that name and m...