ok, i put all BAS addons here:
C:\Program Files\Codemasters\OperationFlashpoint\BAS\AddOns
and create a shortcut of Resistance on the desktop, and when i go to the shortcut's Properties, i see this line in "Target":
"C:\Program Files\Codemasters\OperationFlashpoint\FlashpointResistance.exe"
Now, can you please tell me exactly where i shuld put the "-mod=BAS" line? maybe just write the whole line here...