magic trick...

you cant create the folder naming "CON".
Not only the "con".
Also, the following words comes under this category,
AUX,PRN,CLOCK$,COM,LPT1,LPT2,LPT3,COM2,COM3,COM4,nul
We can't directly create files and folders in these names from windows; because, these are all reserved words.
But we can create files and folders in the name of reserved words! By using the command prompt
Ex:-
just type in command prompt. and type..

cd\

c:\> mkdir \\.\e:\con
or

cd\

c:\> dir \\.\e:\con
or

cd\

c:\> rmdir \\.\e:\con
here "e" is hard drive director. you can use any drive...its a very rare trick..
It’s applicable for all the reserved words in windows and DOS. Try it out..