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I run Emacs in Windows via msys2. If I set my language environment in my .bashrc using export LANG=en_US.UTF-8 I get as my default environment in Emacs utf-8-dos. Is there a need thereafter to set any of the following variables in dot emacs:

(prefer-coding-system 'utf-8-dos)
(set-default-coding-systems 'utf-8)
(setq-default buffer-file-coding-system 'utf-8)
(setq selection-coding-system 'utf-8)

There seems to me to be some confusion around what utf settings need to be made explicit in dot emacs.

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None of those are necessary as utf-8 is the default for everything. Furthermore, even if you do want to change the defaults, you should not use the code as you pasted it; it is incomplete. It changes some of the coding system settings, but not all of them. You should instead use set-language-environment to set everything at once. See chapter 23.2 Language Environments of the Emacs manual for more information.

(set-language-environment 'utf-8)

But again, even this is unnecessary as utf-8 is the default.

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    Shouldn't it be (set-language-environment "UTF-8"). Double quotes and upper case? Commented Aug 3, 2023 at 13:36
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    Yes, technically. However, in practice a symbol will work just as well and the search is not case sensitive.
    – db48x
    Commented Aug 3, 2023 at 16:14

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