/usr/share/dbus-1/services/org.a11y.atspi.Registry.service is in at-spi2-core 2.10.2.is.2.10.1-0ubuntu1.
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.a11y.atspi.Registry
Exec=/usr/lib/at-spi2-core/at-spi2-registryd --use-gnome-session
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