[EXPLORER] WinKey+E is incompatible (opens filebrowser in ReactOS, but not in WindowsXP)

tested with our explorer from 0.4.10-dev-533-g27c3a4d (but this did never work up to now)

On ReactOS you can properly invoke the filebrowser by pressing WinKey+E.
Contrary when copying our explorer.exe into Windows XP the key-combination does not work.

Part of that implementation is in explorer itself, and most deep-down-part that is involved is in
win32ss/user/ntuser/hotkey.c

Seems as if we implemented the chain in a Windows-incompatible way somehow.

Side-note: Contrary pressing Win+R to invoke the run-dlg does properly work in Windows with our explorer.