I just thought I would post my experience:
I was able to get [the original] Roller Coaster Tycoon to work today. I was able to successfully install the application, but every time I launched it, the game would take me to the screen that gives you the options to start a new game/load/tutorial/quit. Regardless of whatever I clicked, it would NOT do anything, just stay at that screen. When I quit the game [the only option that worked], there would be a window saying something about 'ACCESS VIOLATION' and 'EXCEPTIONS RAISED', followed by a bunch of zeros [000000 000000 000000...].
SO, I fixed this problem by finding a patch at [http://www.atari.com/rollercoastertycoon/patches.php].
I downloaded that file, dragged it to the Crossovers icon, installed it, relaunched RCT, and then RCT worked just fine.
I will mention, though, that right-clicking acts odd [mainly when you try to remove a tree or something].
I just thought I would post what happened to me so that it could potentially help someone else.