Combat Mission: Battle for Normandy (2297010)

Compatibility Report

• Name of the game with compatibility issues: Combat Mission: Battle for Normandy
• Steam AppID of the game: 2297010

System Information

• GPU: Nvidia GTX 1070
• Driver/LLVM version: Nvidia 530.41.03-3
• Kernel version: 6.2.10-arch1-1 (64-bit)
• system info from steam:
• Proton version: Experimental

I confirm:

• that I haven't found an existing compatibility report for this game.
• that I have checked whether there are updates for my system available.

steam-2297010.log

Symptoms

Game starts after hitting play on launcher, but crashes immediately with the message "Could not initialize OpenGL graphics. Please update your OpenGL drivers."

It seems that somebody has already found what the issue is.
https://www.winehq.org/pipermail/wine-bugs/2017-May/470327.html

and made a guide to compiling proton with the patch
https://github.com/Rufus111/combat-mission-linux-guide

Start with the linked steam-2297010.log, then read the Wine bug report and the Proton patch guide referenced in the issue. Compare the reported failure with the proposed patch and validate the result by launching Combat Mission: Battle for Normandy under Proton Experimental without the OpenGL initialization crash.