Question

do you know how to make folder named "CON"????

Answer 1

The came from the days of DOS where con stands for the console.
In a cmd window, you can create a file called "test" using
copy con test
first line
...
last line
ctrl-Z to end data entry.
Similarly, you can do copy test con to display the file.
So con is an inherited device name that you cannot use as a file name, unless it was changed in Windows 7.
Home someone else has more information.

Answer 2

It is still reserved in Windows 7.

Answer 3

Thanks for the update.