bitstop came to know about the OPX from the Microsoft Partner conference in Boston. Here is an excerpt from http://www.msfn.org/board/index.php?showtopic=71159 :
The OPK eXtender is a powertoy for the Windows® OEM Preinstallation Kit (OPK) that adds system builder-specific features to the OPK. OPX extends the functionality of the OPK in two ways:
• Automating many of the manual OPK tasks.
• Adding new features designed to meet the needs of system builders.
OPX adds a management layer to the preinstallation infrastructure that you create with the OPK. With the graphical user interface (GUI) of OPX, you can run the most frequently used command-line OPK tools and manage the configuration sets created by the OPK.