Trouble running Command and Conquer Collection in Origin on Mac using Parallels

I am trying to run the Command and Conquer Collection on Origin on my Macbook. I had to install Microsoft Parallels to get it to work...I got Command and Conquer Generals working fine, except that when I save a game and try loading it, it says that it failed to load the game at <location where it was saved>. So, I am kind of stuck at the moment. Anyone know what is going on? I am on Windows 10 on Parallels and using Big Sur on my Mac. Thanks.