Interesting... ??
I was working on a video flle today, and decided to save my work as a file named 'con' (referring to the dodgy content) and discovered that it is impossible for Windows to save any file named 'con' as it is a word reserved for windows operating system.
Apparently there are several words that fit into this category, and cannot be used in either upper or lower case.
Do not use the following reserved names for the name of a file: CON, PRN, AUX, NUL, COM1, COM2, COM3, COM4, COM5, COM6, COM7, COM8, COM9, LPT1,
This rule dates from 1974. You learn something new every day.