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It is possible to run Maelstrom through Steam, with the overlay. You just need to go to the Games tab in Steam, and add a Non-Steam game. Point it to the Maelstrom.exe and you can launch it that way. I have just tried it now with ERAS. It will be shown in Steam as Maelstrom though, and not as COAS.

Could I ask which version of New Horizons does this patch add compatibility fixes for? I am currently playing ERAS only on Maelstrom, but originally I played New Horizons, and that game in Maelstrom sounds fantastic.