ResHacker normaly is correct the pe-sum automatical, only if your new file over 10MB. But the 10MB is a windows limitation, if your file bigger then 10MB you have to UPX it first. A member from ouer german nlite forum has written a tool to read out the PE sum an to correct it. This tool is german only but mybe its helpfull for you. http://www.german-nlite.de/index.php?s=&am...st&p=122189 This tool needs Dot.Net2, the name is "PEChecksumBearbeiter" This tool works with drag&drop and the language should not be necessary for use.