This file is indexed.

/usr/share/glib-2.0/schemas/10_libgtk-3-common.gschema.override is in libgtk-3-common 3.18.9-1ubuntu3.

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.gtk.Settings.FileChooser]
startup-mode='cwd'