Patching strong name .NET assembly

[SystemeD]

I didn't try the attachment but I suggest you to not patch mscoree.dll because it's a framework .net assembly and it would be better achieve your result, patching your app and not the framework. Try to disassemble the prog, find a way to recognize the strong name signature lenght inside the file and patch it.
Remember the "/adv" option while running ILDASM, it will give you more advanced feature when dumping (i.e. dump metadata and so on).
Good luck