Thanks tbone but where is the location bar....???
Anyway in another part of the galaxy I found this:
and it gives me a clue so I dragged and dropped the line count osp file into preferences toolbar scripts (which worked!!) and then created my button in the onkly space there was (to the right of the help button) and then with a flash of inspiration selected advanced and put $LC into the code window.
And this works on the NAS drive and elsewhere.
I found a reference to Script Addins in the dupdata directory so off to find that.
Also need to work out how to move my new LIne Count button so its closer to the action.
Thanks.