/usr/share/app-install/desktop/pcmanfm:pcmanfm-desktop-pref.desktop is in app-install-data 14.04.0.
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]
X-AppInstall-Package=pcmanfm
X-AppInstall-Popcon=3220
X-AppInstall-Section=universe
Type=Application
Icon=user-desktop
Name=Desktop Preferences
Comment=Change desktop wallpapers and behavior of desktop manager
Categories=Settings;GTK;DesktopSettings;X-LXDE-Settings;
Exec=pcmanfm --desktop-pref
StartupNotify=true
Terminal=false
NotShowIn=GNOME;XFCE;KDE;
X-Ubuntu-Gettext-Domain=app-install-data
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