File:Search-ms.png

Summary
A virtual folder in Windows Vista is physically an XML file, which encodes the search string, with an  extension.

Fair use rationale
This software is copyrighted, but its screenshot is being used in the Windows Search article under U.S. fair use laws, because:
 * it helps to visually identify the software; in that sense it furthers the goal of providing verifiable information.
 * it does not limit, nor does it claim to, limit the rights of the copyright holder.
 * it does not, in any way, assist in illegal reproduction of the software or any other things covered by the license of the software.
 * it is being used for informational purposes.
 * the software is copyrighted, so a free equivalent cannot exist.