Why cant we make a folder nameed con in windows??

The following reserved device names cannot be used as the name of a file:

CON, PRN, AUX, CLOCK$, NUL, COM1, COM2, COM3, COM4, COM5, COM6, COM7, COM8, COM9, LPT1, LPT2, LPT3, LPT4, LPT5, LPT6, LPT7, LPT8, and LPT9.

CON is reserved for console, PRN is reserved for printers………..etc.

You must avoid using these names as a file name suffix or file name body, so you have to avoid names such as aux.c, file.aux or NUL.txt.

You can make folder named con in c drive from command promt.

Press windows+r and type in cmd

then at the command prompt type  md \\.\\c:\con

to remove this folder type rd \\.\\c:\con