/usr/share/applications/org.gnome.Nautilus.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 17 18 19 20 21 22 23 24 25 26 27 | [Desktop Entry]
Name=Files
Comment=Access and organize files
Keywords=folder;manager;explore;disk;filesystem;
Exec=nautilus --new-window %U
Icon=system-file-manager
Terminal=false
Type=Application
DBusActivatable=true
StartupNotify=true
Categories=GNOME;GTK;Utility;Core;FileManager;
MimeType=inode/directory;application/x-gnome-saved-search;
X-GNOME-Bugzilla-Bugzilla=GNOME
X-GNOME-Bugzilla-Product=nautilus
X-GNOME-Bugzilla-Component=general
X-GNOME-Bugzilla-Version=3.14.3
X-GNOME-UsesNotifications=true
Actions=Window;
X-Unity-IconBackgroundColor=#af4853
X-Ubuntu-Gettext-Domain=nautilus
OnlyShowIn=Unity;
[Desktop Action Window]
Name=Open a New Window
Exec=nautilus --new-window
OnlyShowIn=Unity;
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