Difficult Question about API

[FantastichenEin]

Chaps,
I need to get the path of an active window (normally a folder).
However the path is not always in the caption.
Also is there a unique identifier (not the path) for each folder that exists (not the handle) even when the window is not open.
Cheers

[FantastichenEin]

Have not explained it to well?

Right...
On my screen I have a window. It is the folder C:\temp.
I need my vb program to know that the path is C:\temp however I cannot use the caption as the caption just says temp.
The above is just an example. I need this to work for all folders and files.
So what I need is an API function that can get the path just from the HWND of the current window. I already have the HWND.

Thnks