Yeah, that part would work but he talks about it like you can just open it in notepad and make the changes and save it. He doesn't explain that that file also needs a matching timestamp or date. I mean did MS put out different ei.cfg files all with the exact same date and time used in his example? If not then its going to have a different hash to what the original is right? Edit Just checked my own ISO, didn't realise they all had exactly the same date and time. Apologies! I can see how this can produce the same hash for official Windows versions if users wanted to do that, but *add* any other file and you will get a different hash.