Call powershell commands from script

Hi,

I need to execute powershell commands from script.

I have found on \Modules\QBM\dvd\AddOn\SDK\ScriptSamples\11 Powershell and example but it requires to download System.Management.Automation.dll from http://www.microsoft.com/downloads/en/confirmation.aspx?familyId=50633a1f-a665-425d-923c-1a269f8ac084&displayLang=en

However that link seems to be down.

Is this functionality still available? should I download the dll from other location?

Thanks.