[Dev-C++] GTK in Dev-C++, window handles

Hello all,
 
Is there a way to retrieve the window handle (hwnd) of a GTK window?
There's an external variable something like gtk_root_hwnd which might be
related to this, but I just thought to ask if someone knows.
I need the handle to perform some operations with Win32 api.
Of course it isn't portable but Win32 api routines are neither ;-)
Thanks!
 
-Vesa