you can download backup files for gta iv
just type gta iv backups in google and thats all (i think the page is gtadownloads)
there is some file locations.i think there is the resident.rpf file.
EDIT:sorry, do you have the weapons.ivaud extracted?
if you do, just import it with spark iv in resident.rpf ok?
open iv has sound bank format but spark iv ivaud format. This post has been edited by aacclapd on Wednesday, Jul 11 2012, 12:09