/usr/share/kde4/apps/khelpcenter/plugins/Scrollkeeper/scrollkeeper.desktop is in khelpcenter4 4:4.8.2-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | [Desktop Entry]
X-KDE-KHelpcenter-Special=scrollkeeper
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