You could just ask that to me in the original thread, but the answer for all of the ArmA 2 mods is: Yes, if it says A2 it'll work on OA, can't promise the other way though.
Sometimes I like to think as I started the whole "earplugs" thing.
W0lle: The only advice I can give you is: Do not try to understand BI. You will not succeed and it only makes your brain go boom. I would even go so far and say that not even they understand their own actions :-D.
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