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From: jasonr (Jason Rumney) @  f2s.com
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Subject: Re: how to change file coding system
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Martin Monsorno <monsorno@gmx.de> writes:

> it says:
>
> ,----
> | Multibyte characters awareness:
> |   default: nil
> |   current-buffer: nil

There's your problem. Check your environment for a variable
EMACS_UNIBYTE. Check the way you are starting Emacs, do you have a
script or alias that is actually running "emacs --unibyte" instead?
Lastly, check your .emacs. I don't remember exactly how to switch
Emacs into unibyte mode from there, nor if it is still even possible
for more than just current-buffer, but it probably involves either the
string unibyte, or multibyte in the name of the variable or function.