/usr/share/kde4/config/background.knsrc is in kdm 4:4.11.13-2.
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 | [KNewStuff3]
ProvidersUrl=http://download.kde.org/ocs/providers.xml
Categories=KDE Wallpaper 640x480, KDE Wallpaper 800x600, KDE Wallpaper 1024x768, KDE Wallpaper 1280x1024, KDE Wallpaper 1600x1200, KDE Wallpaper (other), KDE Wallpaper (SVG), KDE Wallpaper 1680x1050, KDE Wallpaper 1440x900, KDE Wallpaper 1920x1200, KDE Wallpaper 2560x1600
StandardResource=wallpaper
Scope=system
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