**SOLVED**
Turned out I managed to accidentally load the beta version instead of the main version. Loaded the normal version of oa and everything started to work. Thanks for the guide!
I'm having an issue with running this under wine. I'm using playonlinux with wine version 1.5.9-raw3. When I launch original arma2, it runs fine, but when I try to run operation arrowhead, it comes up with the message "No entry .profilePathDefault" and if I click ok, a menu with no text appears (and also appears to ignore my arguments, as it loads way too fast).
The menu looks like this:
I also noticed that instead of creating a folder for the profile called Arma2 like it's supposed to, it creates what looks to be a profile with my username and a . (such as d10sfan.) instead of d10sfan.Arma2Profile and it is directly inside the Documents folder,not creating its own folder.
Thanks for the guide, hope there's a way to fix this.