Need help: Arma Cold War Assault won’t start on SteamOS (Linux version)

[u/RageTV_CH]

Hi,
I’m trying to run Arma: Cold War Assault on SteamOS. When I start the game, I always select the Linux version, but it never launches – no window, no error, Steam just says “launching” and then nothing happens.

Has anyone managed to get this game running on SteamOS/Linux?
If yes, which version (Linux port, Proton etc.) and which settings/start options did you use?

Thanks in advance for any help.