Not sure if im following this conversation right but ..
Make sure that the items you want to re-place are in the right path.
EXAMPLE:
create a folder: 3DDATA Then a folder inside that: RES then item you want to replace: Item1.dds
Than place the head folder (3DDATA) in a .zip file, Open up the zip file, then go: File /: Save as: your_mod.genfs
