Hi, Anyone getting error codes when trying to change/replace the imageres.dll file in ResHacker or XN ResEditor, should try the following:
If you have access to a Win XP computer then use that to make the changes to your Win 7 imageres.dll,(in safe mode) transferring it from/to pcs using a usb stick. Once you've replaced the sound with the one you want on the XP machine, boot up your Win 7 pc using an Ubuntu live cd and replace the altered dll into the windows system 32 folder. This worked for me.
Best to use ResHacker to make the changes, I found XN resEditor did not work in Win 7 or XP