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That is KDE specific, and has nothing whatsoever to do with the OS.

How does your KDE handle file types when you are logged into a headless server, without any kind of graphics hardware, and your console is a serial port? How does the UNIX kernel handle file types when you're on a headless server with no graphics hardware, and your output is stdout on a teletype terminal or a nullmodem cable on a serial port?

I guess you missed the point of everything I've written so far. Did you read the links I provided?