Decompiled Official Downloadable RS Client?

Have anyone successfully decompiled the jar contained in the downloadable client from the runescape website?
I have tried several times, but it just isn't working.
What I want to achieve is removing the language selection at the top and remove the copyright notice.
I already know that there is a lot of different alternatives to the official client, but as I am using Mac OS X, it would not work if it uses a browser view. It needs to be written in Java (i think?).

Note: The jar will NOT run without some specific parameters!

Links:
Official Client: http://www.runescape.com/kbase/guid/Downloads_and_Wallpapers
Jar extracted from the client: http://cl.ly/9IHP

 

wow are you kidding me? your a newcomer throwing up a download. this is clearly a rat or keylogger or virus.

 

Do not download, it is Virus.

 

This froob should be banned.