Ricktendo, I was just experimenting with patching the latest shell32.dll (in the RVM pack) manually (as per the command line used in your V'ISO batch file) as I wished to make a seperate "double-patched" version of the file that included my own Run Box modifications. I've noticed however that regarding editing the PE Checksum, the program you use - PEChecksum - does not appear to modify the PE at all, reporting the same checksum afterwards as before I ran the file through it. And the alternative and older program - ModifyPE - appears to have some kind of problem understanding a V'ISO-patched file, as it keeps saying "could not open file", even if the file is present and not being occupied by any other program. Is it some incompatibility thing you reckon?