A new demo has been added in the Windows XP Professional demo portion.The detail of this demo is

Title: How to Display Hidden Files and Folders in Windows XP

Objective: The objective of this demo is to teach you how to display hidden files and folders in windows XP. By default, many of the important system files and folders in Windows XP are hidden, meaning they cannot be seen by navigating with explorer. User created files can also be hidden. A simple option change enables you to see all hidden files and folders with Windows explorer.

If you are a subscriber, then click the Demos link in the navigation menu to view the complete list of demos.