Yes, that was the problem. I should have been looking for the unicode version of the string. For anyone else looking to mod the mac / os x version of xcom enemy within, the string is found around 0x1fe7eb3. (You also need to edit the hosts file to prevent it phoning home, which os x is found /private/etc/hosts. Also, thank you very much to OldOne822, Drakous79, dubious intent and Amineri for all valuable help in figuring this out!