Use GenPatcher (https://legi.cc/downloads/genpatcher/) to make the original game work basically perfectly on modern OSes, as well as implement a bunch of stability, balance, and other optional fixes.
Any idea if this can get it working on Linux? I dumped a couple hours into trying to get it running under wine and proton but couldn't figure it out.
Generlas is a very picky game, with random mismatch errors all the time on windows, even as a linux gamer I've given up on running it on linux, it has enough issues as is!
This. I think part of the reason an OpenCCG hasn't shown up is because the modding/community support for the original CD images/binaries is so strong. Plus... the game isn't exactly hard to find (it's on Origin, for example) and isn't exactly hard to find (if you know what I mean).
My friends and I have a C&C Generals night a couple times a year. We use the Rise of the Reds: Babushka's Revenge mod, which is sort of a mod of an old mod. It balances things out quite a bit and adds some new stuff. I think it includes widescreen support
You should try the Red Alert 3: Evolution mod. Its C&C Generals on RA3.