How do I use Kubuntu restricted extras?

[Larry Alkoff]

Using Kubuntu 10.04 LTS.

I recently went to
http://appnr.com/package/kubuntu-restricted-extras
and downloaded the file
/usr/share/app-install/desktop/kubuntu-restricted-extras.desktop

It isn't in the repositories or /etc/apt/menu.list
and there is no man page.
Do I use apt-get?

How do I use this?