install 
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OPEN IV is required.

1 - open OPEN IV select gta iv ofcourse, and now click edit mode.

2 - now open these folders in this order.
    
(pc - audio - sfx - resident.rpf - RESIDENT)

3 now drag the WEAPONS file from mod into RESIDENT.
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now the mod should be installed.

also if you find a glitch then tell me in the comment section. im not a programmer so i can't promise ill be able to fix.

this mod does support complete adition and have actually only been tested there, but im planning on testing other versions soon. but im pretty sure it works on older versions too.