I just installed IE5.5 on my NT 4(chinese version) machine. Then I want to re-install SP6a , but it says my machine is high encryption, and the SP6a(chinese) version is standard encryption, so it cannot proceed. In microsoft's websitehere, it says I have to edit the update.inf in the service pack source files. But the SP6a file is a single .exe file of 36MB size. How can I extract the files to edit update.inf?