Thank you for your post.
The Favorite Hosts is stored in the Registry (Windows). You will find it under:
My Computer -> HKEY_CURRENT_USER -> Software -> FileMaker -> FileMaker Pro -> 9.0 -> FavHostInfo -> Entry<n>
If you don't have any "Favorite Hosts" entries, then add one, and then modify the entries of IP Address, DisplayName and FileNames for the files not on the same subnet.