[HECnet] Installing DECnet netkit to RSX-11M Plus 4.6

I have built and SYSGEN'd a fresh system in a SimH instance of RSX-11M Plus 4.6 and am trying to install DECnet and NETGEN it. I am struggling with the tape image I have though. I have the 'decnet11mp46-netkit.tap' image from bitsavers. I have mounted it but when I try to copy the PREGEN.CMD file (following Matt Burke's guide here http://9track.net/pdp11/decnet4_netgen) it says it's not there. I am unfortunately not well enough voiced in RSX-11M to probe further from here to find out what's going on. Anyone got any clues or ideas? -- Mark @ DECtec.info twitter.com/DECtecInfo