To use these files, you must have already installed 3dsmax 5 and the Rise of Nations exporter plugin availible on this website.
EDIT 2nd June 2010:
I just tested it again and it seems that it works for me when you copy the dll files to C:\Windows\system32
To install, copy the dll files to the same directory you copied the Ronexporter.dle to. The ronexporter.dle was the file that came with the official Big Huge Games exporter. If the exporter still fails to work, then please comment so i can fix it. I'll be able to provide more detailed instructions when I get my 3dsmax 5 working correctly.