I received this reply from Wrox:

"I understand what you're asking. We currently have no plans for a book on exam code: CX-310-081

The former Wrox Press Company was liquidated in the Spring of 2003 and the assets (books) were sold to various companies. Wiley acquired 34 of the over 350 books in the liquidation proceedings. You'll find a complete list of books now owned by Wiley at
http://www.wrox.com/WileyCDA/Section/id-105077.html

If your book is not listed there, it may have been acquired by A Press at www.apress.com"