This tests that unknown file types are handled correctly when dropped in the window
     
        - 
            Drag a file that WebKit doesn't recognise -- eg. a disk image, tarball, etc.
 WebKit should cause a Finder window to open, with the dropped file selected.
-  
            Attempt to drop a directory onto the WebView.
 The drag should not be accepted, and the drag cursor should be the standard disallowed drag cursor.