This file is indexed.

/usr/share/kde4/config/config.README is in kdelibs5-data 4:4.13.3-0ubuntu0.5.

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

The actual contents of the file can be viewed below.

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In this dir, /usr/share/kde4/config, default configurations are loaded.
If you as a sysadm needs to change default config, copy the relevant file(s) 
into /etc/kde4/ and edit them. The files there will take precedence over these.