pcmanfm used in shortcuts gnome-panel instead of nautilus

[thuban]

You know, when you use these shortcuts, as an example to open your home folder, It's nautilus which is used. But since intrepid, it's pcmanfm which is used by default on my computer.
And, if I delete pcmanfm, if then I launch these shortcuts, an error is returned, saying pcmanfm can't be found...
Nevertheless, these files seems to be ok :
/usr/share/applications/nautilus-folder-handler.desktop :

TryExec=nautilus %U
Exec=nautilus --no-desktop %U
NoDisplay=true
Terminal=false
Icon=folder-open
StartupNotify=true
Type=Application
MimeType=x-directory/gnome-default-handler;x-directory/normal;inode/directory;application/x-gnome-saved-search;
OnlyShowIn=GNOME;
X-GNOME-Bugzilla-Bugzilla=GNOME
X-GNOME-Bugzilla-Product=nautilus
X-GNOME-Bugzilla-Component=general
X-GNOME-Bugzilla-Version=2.24.1
X-Ubuntu-Gettext-Domain=nautilus

[thuban (crazyhandballeur)]

I don't know if it is important, but /usr/share/gnome/default.session doesn't exist.