Re: [O] Add publishing with utf8

[sindikat]

I added this to my .emacs: 

(set-language-environment "UTF-8")
(prefer-coding-system 'utf-8-unix)
(org-export-html-coding-system 'utf-8-unix) 

but Emacs still opens files with pure ASCII as undecided-unix, thus 
producing wrong iso-8859-1 in my charsets again. I don't know what to do. 
Is there any way to force Emacs open any file as utf-8?