It's not in Windows in the first place. The headlined article does explicitly say this.

It's library code in a large number of applications programs.

* http://jdebp.eu./FGA/dos-character-26-is-not-special.html

FWIW it's generally advised to not open files in text mode on Windows anyway. The handling of \x1A is one reason. The automatic mangling of newlines into Windows newlines is another.

Edit: And while cmd's type does process it, modern stuff like PS's Get-Content does not.

Someone could even write new code that relies on it.