After a few iterations, v1.03 is available to addresses some crashes with versions of Caesar III (which were not obtained from gog.com) that halted on "Missing CD". The built-in fix maps the game directory as a fake CD drive.
Your feedback is very helpful. Please re-try the app after every update so I can apply more fixes.
I've also received feedback about the configurable game controls - these are going to be improved over time to accommodate increased playability for this game and future ones.
I'd be happy to see some videos of people using Winulator successfully :)