Open a notepad and write anything in it ,but while u are saving the file save it with the name CON Now observe what did u see Does any1 knows the reason behind it......
but rather than this..there are nearly 30 other which windows wont allow you to save as..since it got its double meaning word.. this word became famous then the rest
Old stuff is really, really old, lol. There are alot of tricks like this all over XP. I forgot most of them, but Google will reveal em'.