I'm afraid I'm another person with the "can't find g1.dat" problem. I have scoured these message boards trying to find a solution. Here is my deal:
I downloaded RCT2 Deluxe from GOG, its in my C:\GOG Games\RollerCoaster Tycoon Deluxe folder, I pointed the launcher at that folder and I still get the error. I looked in my data folder, and I don't see a g1.dat file, there are bunch of dat files, but no g1. Am I crazy?
Thank you in advance for any help!