I had hoped someone would have really answered your question by now. I
just found it and it was
easy I expect you just over looked it. Here is what I did, I opened
Places on the top pane, which
is the file manager, under Edit you will see Preferences at the bottom.
When that window is up
click on tab Behavior at top and under Behavior the third option to
click is "Open each folder its
own window".
On mine it then opens new folders and whatever in its own window.