/usr/share/dbus-1/services/org.gnome.Rhythmbox3.service is in rhythmbox-data 3.0.2-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | [D-BUS Service]
Name=org.gnome.Rhythmbox3
Exec=/usr/bin/rhythmbox
|