/usr/share/kde4/config/plasma-themes.knsrc is in plasma-desktop 4:4.8.5-0ubuntu0.4.
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 | [KNewStuff3]
ProvidersUrl=http://download.kde.org/ocs/providers.xml
Categories=Plasma Theme
StandardResource=tmp
InstallationCommand=plasmapkg -t theme -i %f
UninstallCommand=plasmapkg -t theme -r %f
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