Windows Server 2003 Access-based Enumeration makes visible only those files or folders that the user has the rights to access. When Access-based Enumeration is enabled, Windows will not display files or folders that the user does not have the rights to access. This download provides a GUI and a CLI that enables this feature.

Version: 1.0.424.5
Date Published: 4/8/2005

There are three Windows Installer packages. One each for x86, amd64 (also for x64) and ia64 machines. The msi packages can be used on any SKUs for each of these architectures. Download the msi and run it on the server and the GUI and CLI for Access Based Enumeration will be installed on the server. A white paper describing the feature and the GUI and CLI will also be installed on the server.

http://www.microsoft.com/downloads/details.aspx?FamilyID=04a563d9-78d9-4342-a485-b030ac442084&DisplayLang=en