Gecko Patching Files (GPF)

[_Vuze_]

Hi dear Community,
I am currently working on a patch for Monster Hunter 3 and as I don't support piracy, I wanted to make a GPF Patch in order to make it at least a bit harder for "Softcore" pirates who don't want to "waste" DVDs.
Only problem is: I dunno how to create a GPF File :S
Is there any tutorial? Or could sb tell me?
This is really important to me :O
thx and best regards