/etc/xdg/wallpaper.knsrc is in plasma-workspace 4:5.8.6-2.1+deb9u1.
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 | [KNewStuff3]
ProvidersUrl=http://download.kde.org/ocs/providers.xml
Categories=KDE Wallpaper 800x600,KDE Wallpaper 1024x768,KDE Wallpaper 1280x1024,KDE Wallpaper 1440x900,KDE Wallpaper 1600x1200,KDE Wallpaper (other)
StandardResource=wallpaper
Uncompress=archive
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