/usr/share/kubuntu-netbook-default-settings/share/config/workspaceoptionsrc is in kubuntu-netbook-default-settings 11.10ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | [TitleBarButtons]
DesktopLeft=MS
DesktopRight=HA__X
|