Holy smokes! The auto-detect GPU thing worked! Unchecked it and no more errors. Thank you so much for your help, and the game!
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I'm running on a 2011 MacBook Pro with High Sierra, with AMD 6750M graphics. The error pops up right when I attempt to start the game.
I tried changing video driver & resolution in the winsetup.exe program included. In Wineskin settings, too, tried forcing the use of XQuartz or Mac driver. Always get the same error. After the one I took a screenshot of, there's another window with more information: