/usr/share/kde4/config/kwinscripts.knsrc is in kde-window-manager-common 4:4.11.8-0ubuntu6.
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]
Categories=KWin Scripts
StandardResource=tmp
InstallationCommand=plasmapkg -t kwinscript -i %f
UninstallCommand=plasmapkg -t kwinscript -r %f
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