If you have installed latest SDK for Vista (http://www.microsoft.com/downloads/details.aspx?FamilyID=117ecfd3-98ad-4d67-87d2-e95a8407fa86&DisplayLang=en) and trying to write an applications for Windows PowerShell (http://www.microsoft.com/windowsserver2003/technologies/management/powershell/default.mspx) you may be looking for System.Management.Automation.dll assembly.
It is located in c:\program files\Reference Assemblies\Microsoft\WindowsPowerShell\v1.0
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About leonbrag
Hi,
My name is Leon Braginski. I am Lead Program Manager in the Developer and Platform Evangelism group.
I manage technical relation with strategic global ISVs.
Part of my job is to make sure that Global ISV successful in adopting and using cutting edge Microsoft technologies.