This file is indexed.

/etc/xdg/emoticons.knsrc is in plasma-desktop 4:5.5.5-0ubuntu1.

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

The actual contents of the file can be viewed below.

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[KNewStuff3]
ProvidersUrl=http://download.kde.org/ocs/providers.xml
Categories=Emoticon Theme
TargetDir=emoticons
Uncompress=always