Thanks both of you. I did not check the box myself, as I never read a book on a computer; I only use the reader to check files, find a quote, etc. Things I cannot do as easily on the Kobo that is too slow and poorly designed
But I think changing the file you are supposed to view only is not a good programming practice. This should be written to an external file.
Changing the file date should only be used for a serious file modification.