This file is indexed.

/usr/share/GConf/gsettings/gnome-bluetooth-nst is in gnome-bluetooth 3.2.2-0ubuntu5.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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[org.gnome.Bluetooth.nst]
last-used = /desktop/gnome/nautilus-sendto/last_obex_device