Is it possible to change the vehicles weapons in Command and Conquer Generals: Zero Hour?

I managed to change some vehicles and constructions health values and costs by modifying INIZH.big , but if I try to assign another vehicle weapon to a vehicle which doenst originally have that weapon, the game crashes at start. I thought may be it isnt as simple as changing the reference to the weapon’s object name in the primary weapon property, but may be I’m making another mistake since when I changed vehicle costs or health figures, sometimes it also crashed, which makes me think may be I’m adding some spaces or something I can’t see with the editor, and generating a source code syntax error (which I dont know if I can check somewhere, is there a log file for errors?)

Is it possible to change the vehicles weapons in Command and Conquer Generals: Zero Hour?