SOLDIERX.COM Nobody Can Stop Information Insemination

When Editiing the MRI 5.0.3s artwork with MS Paint and then replaceing it with REShack. It always ends up breaking the MRI stating that it is not a valid win32 structure. Could you guys give me a hand with this. What program to use or how. Im totally new to this.

Also I have been able to edit the menu and add a program to it, however cant seem to get it to run. What can I do?

Thanks in advance,
Beaswax19