The problem is when I go through to Libraries box in Poser which shows all the current Poser 7 content and press the + symbol at the bottom to add an additional Runtime it tells me my old Poser 6 Runtime "...does not seem to be a Runtime folder.." as above.

If after Poser has opened I change the name of the Runtime folders, that is change the name of the old Poser 6 Runtime folder to 'Runtime' and the current P7 folder to 'Runtime2' (for instance) then it imports the renamed P6 folder OK. But Poser 7 won't start up with the Poser 6/Poser 7 folders named in this way.

Is an externalm library different to what I have suggested above (ie adding an additional Runtime through the libraries)?