/usr/share/images/desktop-base/debian-edu-joy-wallpaper.png.desktop is in debian-edu-artwork-joy 0.52-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | [Desktop Entry]
Name=Debian-Edu-Joy
X-KDE-PluginInfo-Name=Debian Edu Joy
X-KDE-PluginInfo-Author=Christoph Muetze <gizmo@pixelz.de>
X-KDE-PluginInfo-Email=debian-edu@lists.debian.org
X-KDE-PluginInfo-License=GPLv2+
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