Fun Trick with NOTEPAD

I am going to show you.. how to append current date & time to a simple text file of Notepad.
>open notepad and type ".LOG"  (without quotes)
>Save it as ".LOG.txt"

now, Whenever you open the file with that text in the first line, in the notepad, "it will insert the
current date and time" at the end of the file. You can start entering your text after that.