In all versions of Windows, we are unable to rename a file or a folder name as CON without third-party file renaming software. Trying to do this in Windows 7 results in an error:
The specified device name is invalid.
Trying to save a file as con.txt in Notepad leads to a similar error:
This file name is reserved for use by Windows.
Choose another name and try again.
Why can't we name a file or folder CON in Windows?
