This file is indexed.

/usr/share/kconf_update/gtkbreeze5.5.upd is in gtk3-engines-breeze 5.5.5-0ubuntu1.

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

The actual contents of the file can be viewed below.

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Version=5
Id=GTKBreeze5.5
Script=gtkbreeze5.5