Okay, guess I'll make an updated post to install CBA and STHUD for Arma 2 Operation Arrowhead. Will work with Combined Operations I suppose.
I haven't played Arma 2 for over a year so decided to put all my @Mods into a different folder and start from scratch.
Like the above, alls we need for now is CBA and STHUD. These aren't required or mandatory but will help you out when playing on Expert.
You can download CBA from here (FTP link is at bottom of the page):
http://www.armaholic.com/page.php?id=6231
Extract the zip and copy the @CBA_CO folder over to your Arma 2 OA directory. Usually:
X:\Program Files (x86)\Steam\steamapps\common\arma 2 operation arrowhead
Now download STHUD:
http://www.armaholic.com/page.php?id=9936
Unzip the file somewhere. Go into a2 folder then copy @sthud to your Arma 2 AO folder.
Your Arma 2 AO (or Combined Operations) folder should look something like this:
Now you can enable these mods with the GUI by going to: Main Menu->Expansions and then enabling and disabling whatever you want.
Since I always want CBA and STHUD loaded whether in single player or MP, I put it in the Steam Launch Options.
Right-click Arma 2: Operation Arrowhead->Properties->General Tab->SET LAUNCH OPTIONS...
At the minimum you should have:
-mod=@CBA_CO;@sthud
If you want to get fancy, add this
-noPause (game runs in background when not in focus)
-nosplash (no intro videos/splash screens/etc)
-world=empty (get rid of loading backgrounds in Main Menu)
if you have a four core CPU this might possibly give you a few more FPS (I haven't thoroughly tested it though):
-high -cpuCount=4 -exThreads=7 -maxmem=2047
This is what my full command line looks like:
-mod=@CBA_CO;@sthud high -noPause -nosplash -skipintro -world=empty -cpuCount=4 -exThreads=7 -maxmem=2047
This is the Arma 3 version video but Arma 2 is the same if you want to get an idea of what this is about.