Have you tested this with any other browsers or another computers IE browser? I'm not familiar with this message at all myself but it seems to me that there should not need to be any interaction with the clipboard and the file manager. Even if you were cutting and pasting into the manager or editor this would be a user initiated action and you should not be prompted even then. It seems that the browser is wanting to directly interact with your clipboard from the script. Do you have any other scripts running on this page, or is it only HTML Editor?