I have both Arma 2 and Arma 2 Operation Arrowhead on steam and when I run '_runA2CO' the black cmd box pops up for a second and closes and Arma 2 OA starts up. I have verified the game cache files multiple times and I have ran Arma 2 before Arma 2 OA.
Here is a screenshot of what is in the black box:
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It is a bit transparent but that was the best I could do.
I can see them but even in steam overlay it says im running Arma OA
---------- Post added at 11:16 AM ---------- Previous post was at 10:07 AM ----------
Also I tried to install 2 mods, I did everything right but they fail to load ingame.