The NOF 2013 help file suggest this method of opening an existing website:
"Creating a New Site from an Existing Site
From the File menu, choose New Site>From Existing website.
The Import website dialog appears.
Select Local or Remote import.
Enter the exact file location and path to the top-level page you want to import:"
HOWEVER - this function does not even exist in the menu - and this is a feature that worked in 8/9/10
and the reason I bought 2013 for!
No- its not a 'nod file from NOF, but a Serif site of mine
Any ideas on how to import a web site?