/usr/share/wallpapers/HorosGreen/metadata.desktop is in plasma-active-data 2.0+git2012021101-0ubuntu4~ppa3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Name=Horos Green
Name[et]=Roheline Horos
Name[fr]=Horos vert
Name[km]=Horos Green
Name[nl]=Horos Green
Name[pl]=Horos Green
Name[pt]=Horos Verde
Name[pt_BR]=Horos verde
Name[sv]=Horos Green
Name[uk]=Хорос (зелений)
Name[x-test]=xxHoros Greenxx
X-KDE-PluginInfo-Name=HorosGreen
X-KDE-PluginInfo-Author=Nuno Pinheiro
X-KDE-PluginInfo-Email=nuno@oxygen-icons.org
X-KDE-PluginInfo-License=LGPLv3
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