to add a script [1] executable to the linux3.tgz file, do I need to
unpack, modify repack it under some linux (eXecute flag), or does
somebody know a trick to solve this under Windows?

Thanks, Rudi.
hardware1.s = rp <ip> //<ip>/volume/path/path/hw1-last-image.zmg
and so on...

Then after a maintainance PXE boot a simple hardware1.s would do at
bash prompt.