/usr/share/applications/nautilus-classic.desktop is in nautilus 1:3.18.4.is.3.14.3-0ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | [Desktop Entry]
Type=Application
Name=Desktop Icons
Comment=Classic session desktop file for desktop icons
Exec=nautilus --no-default-window --force-desktop
OnlyShowIn=GNOME;
NoDisplay=true
X-GNOME-Bugzilla-Bugzilla=GNOME
X-GNOME-Bugzilla-Product=nautilus
X-GNOME-Bugzilla-Component=general
X-GNOME-Bugzilla-Version=3.14.3
X-GNOME-Autostart-Phase=Desktop
X-GNOME-Autostart-Notify=true
X-GNOME-AutoRestart=true
X-GNOME-Provides=filemanager
X-Ubuntu-Gettext-Domain=nautilus
|