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it was a slim chance :P

Hmm... I'm not entirely sure what's going on. Perhaps it's an issue with your installed software? What version of the JDK and JRE do you have? The latest JDK/JRE is Java SE 6 update 23.

1. What OS are you running under? With Windows Vista/7, certain areas require elevated privileges in order to modify (such as the Program Files folder).
2. Do the original file and the new file both...