Inject the file into the appropriate rez file, rename the reznew to texturescripts.rez
And then the folder bypass method:
Make a folder named TEXTURESCRIPTS
And then all subfolders should be named the name of the rez file you are trying to bypass, eg GUNS_M_PV_SR.rez should be a folder named GUNS_M_PV_SR with all the stuffs you did inside.