Interesting, not heard about this method before. I wonder how many other changes there are, as I found the demo felt better than the final game in some ways. There were various patches for the full game in Japan before Empire released it in the West, the demo might be a bit older than that.
I bet the music still doesn't work though; the XP workaround (_inmm.dll) apparently doesn't work on Win7 or above. Although there's this fix in this forum which might work! viewtopic.php?f=3&t=396&start=10
One game I wish was fixed is Sega Marine Fishing though, it has fog you can't see through on Empire's western version, but the Japanese PC demo works fine (and has a multiplayer option missing in the European release) :-/