Civilization VI: Why does the Steam version work, but not the Epic Games one?

I bought Civilization VI from Epic Games when it was on sale at some point, but the wine version is labeled as unplayable on However, the Steam version does work, and I wondered what the difference was between the two and if it could be hacked into working.

Does it work with Proton, or does it have to be run through Steam specifically (maybe an application link could work), or is there something fundamentally different about the two versions (seems unlikely).
These are all thing’s I’ve considered.