This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
It stores the layout in a "PRPT" file, which is similar to the open document standard used in OpenOffice.org. The definition of the XML files inside the ZIP file are defined in the book, so you could open up the PRPT and modify the report directly. We recommend using the Java API to do this manipulation.