Hmm, interesting. It appears to work fine for me. After doing some research, I think the error might occur because the area to the right has an mp3 file for background music (and thence perhaps something about audio codecs)? I'll look into this further. Thanks for the note!
Ahh. I think I had that happen to me once on a different game, but it only really triggered the one error message before crashing. I fixed it by running the affected mp3 through Audacity and making the bitrate constant instead of variable (i.e.- re-exporting it). If I knew which filename the song that's meant to play was I'd give fixing it a shot on my end (or just go through all of the mp3s one by one).
I don't know if RM2003's incompatibility with variable bitrate files has anything to do with codecs, though, or why it only seems to happen to some people when they extract RM2003 games.
The file that's meant to play in the area to the right of the mountainous map is wave2.mp3 in the Music folder. I just re-exported the file in Audacity with a constant bitrate -- the bitrate had been set to "Preset," but honestly I know pretty much nothing about audio stuff, so I don't know if that's something that would affect gameplay or not. Darned confusing.