So as it is known that CON named folder is not possible in windows.
But u can create it Here is the way to do so.
You can create it by using command prompt. The command of doing that is as given below :
This will create folder named CON in ur C: drive u can create it in any drive by just replacing C with the drive letter in above command. Now u shall find that u are not able to delete that folder even by using command prompt. The DEL command will also not work. But u can delete it by using following command :
Now u can also do the same thing with other folders like PRN, COM1, COM2, etc. that are not normally created in window.