The text coding sytem for Emacs

[Water Lin]

I re-install my Windows XP system. But after I start Emacs, it treats my
text file as iso-latin-1-unix. But actually the coding system should be
utf-8. So Emacs shows the text as a mess.

When I change the coding to UTF-8 by M-x
revert-buffer-with-coding-system, the text file works normally.

How can I let Emacs to treat text file as UTF-8 by default?

Thanks

Water Lin

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