/usr/share/dbus-1/services/org.xfce.FileManager.service is in thunar-data 1.6.10-2ubuntu1.
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.xfce.FileManager
Exec=/usr/bin/Thunar --daemon
|