Can u ever try to create a folder named "con" in ur PC it does not happen in a normal way.....
to create a con folder follow the below code.... its easy....
hold "alt" and type "0160"(for invisible character) and now leave alt and type con. now u r having folder named con
this also works for foldernamed nul too.....

Thanks for the tip , this doesn't appear to work in vista tho.

May be lol, it was for windows XP.
I never tried it for vista. I dont think this could work for vista, even though it works for XP...