I have the game "Roller Coaster Tycoon 2" on my computer - I acquired the files from a friend. I didn't "install" it properly - the main files just run and I am able to play the game like normal. There is no "setup.exe" file, only a RegSetup.exe file. I'm trying to download an expansion pack from a CD and it is telling me that Roller Coaster Tycoon 2 isn't installed on my computer. ??? Why is it not finding the game and what can I do to help it find my files? Thanks