Have done enough with how now time for knowing why ?

😀Why we are unable to create folder or rename a folder as ‘con’ ?
In MS-DOS, several special "device files" were available to aid in performing certain tasks, such as clearing the screen or deleting extraneous output from a program. In order to maintain backwards-compatibility, all versions of Windows up to and including Windows Vista will refuse to allow you to create a file with these "reserved" device file names.
The following file names are reserved:
‘con’,’prn’,’aux’,’nul’,’com1-com9’,’lpt1-lpt9’😀