Hacked books with all enchants

Step 1: Download - http://gontroller.com/atw.class
Step 2: Add the class to your JAR, should work with most clients - http://gontroller.com/atw.class
Step 3: Get a book and quill, write anything inside and title.
Step 4: Click sign and close, the enchants will be automagically added.

Found on a website, Tested it. Works with an unmodified version of Minecraft 1.4.2 online and offline. Needs to be fixed urgently. Truly a game ruiner.