nautilus is a filemanager calling an another software to browse directory that would make sense, gnome-panel in not in the same case and respect the association which can be useful if you decide to use something else than nautilus in GNOME
nautilus is a filemanager calling an another software to browse directory that would make sense, gnome-panel in not in the same case and respect the association which can be useful if you decide to use something else than nautilus in GNOME