Adminpak for Windows Vista
The official name for the so-called Adminpak is Windows Server 2003 Service Pack 1 Administration Tools Pack. For earlier versions, the name of the setup file was admipak.msi, hence the name Adminpak. You will also often find Adminpack. It is a collection of free administration tools which allow you to remotely manage a Windows Server.
http://4sysops.com/archives/adminpak-for-windows-vista/
