On a Linux Red Hat system, it's a Bourne SHell.
So you can edit it.
It seems to be linked to nsrwizreg, which, according to the man page:
"add or delete extensions to/from either:
- the wizard ressource file
- the client ressource file on the Networker wizard computer."
or
"add or delete clients from the wizard ressource file on the Networker wizard computer"
I hope it'll help.