/usr/share/app-install/desktop/unity-control-center:unity-appearance-panel.desktop is in app-install-data 15.10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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X-AppInstall-Package=unity-control-center
X-AppInstall-Popcon=8071
X-AppInstall-Section=main
Name=Appearance
Comment=Change the background and the theme
Exec=unity-control-center appearance
Icon=preferences-desktop-wallpaper
Terminal=false
Type=Application
StartupNotify=true
Categories=GNOME;GTK;Settings;DesktopSettings;X-Unity-Settings-Panel;X-GNOME-PersonalSettings
OnlyShowIn=Unity;
X-Unity-Settings-Panel=appearance
# Translators: those are keywords for the appearance control-center panel
Keywords=Wallpaper;Background;Screen;Desktop;Theme;Appearance;Launcher;Unity;Menus;
X-Ubuntu-Gettext-Domain=app-install-data
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