Cannot open KDE Component Chooser

[Greg Booth]

> In Kcontrol the KDE Component Chooser is missing. This was also the
> case in a previous Ubuntu install, however in that one I could simply
> open /usr/share/applications/kde/componentchooser.desktop in Konqueror
> and use it. In this install, I cannot. What can I do? Is there a file
> that I can manually edit? I need to set Thunderbird as the default
> email client.
>
> Thanks in advance
>
> Dotan Cohen
>

update-alternatives --config ?????  should do it but I'm not sure what
the option is.
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The box said 'Requires Windows XP or better'. So I installed LINUX