well wounldnt say it works just like a .dll injector but wat ever rez inject is for u to inject mods for example u get the mod u made / download then u click on the ... and opens a window click on the what ever file say guns_t_pv.rez inject ur mod in there and then u got a new one called guns_t_pv.reznew erase the new and place in combat arms game folder .. and u got to change what it looks like / does before u inject it u cant just open rez inject and hope for a bad ass mod to come out of it