So, I closed the game and folders when I made that last post. When I went back to double click the start.bat file, it again would not let me open a saved game. So, I cut and pasted the CPU throttle folder in the Civilization main folder, then I cut and pasted the CPU throttle folder back in the folder where the saved games were, and I can again play saved games using the program. I don't know enough about programming to know what is wrong. Thanks, in advance, for your help.