This file is indexed.

/usr/share/kde4/config/plasma-overlayrc is in kde-workspace-data 4:4.8.2a-0ubuntu4.

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

The actual contents of the file can be viewed below.

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[KDE Action Restrictions][$i]
plasma/allow_configure_when_locked=false

[Constraints]
FileDialog=false
LaunchApp=false

[General]
ExcludeCategories=Windows and Tasks,Application Launchers