/usr/share/app-install/desktop/declarative-plasmoids:kde4__active-news-reader.desktop is in app-install-data 15.10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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X-AppInstall-Package=declarative-plasmoids
X-AppInstall-Popcon=0
X-AppInstall-Section=universe
Name=News Reader
GenericName=Feed Reader
Comment=A news feed reader for touch tablets
Exec=export PLASMA_CUSTOM_PREFIX_PATHS=platformcontents/application/generic/:platformcontents/application/tablet/:contents/ && plasma-windowed -graphicssystem raster org.kde.news-qml
Terminal=false
Icon=active-news
Type=Application
Categories=Qt;KDE;News;
X-Ubuntu-Gettext-Domain=app-install-data
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