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From: Brian Adkins <lojicdotcom@gmail.com>
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Subject: Re: Can't paste from files with .arc extension
Date: Fri, 7 Mar 2008 09:40:05 -0800 (PST)
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Thanks to Peter, I kept poking around auto-mode-alist and it pointed
me to auto-coding-alist:

auto-coding-alist is a variable defined in `mule.el'.
Its value is
(("\\.\\(arc\\|zip\\|lzh\\|lha\\|zoo\\|[jew]ar\\|xpi\\|exe\\|rar\\|ARC\
\|ZIP\\|LZH\\|LHA\\|ZOO\\|[JEW]AR\\|XPI\\|EXE\\|RAR\\)\\'" . no-
conversion)
 ("\\.\\(sx[dmicw]\\|odt\\|tar\\|tgz\\)\\'" . no-conversion)
 ("\\.\\(gz\\|Z\\|bz\\|bz2\\|gpg\\)\\'" . no-conversion)
 ("\\.\\(jpe?g\\|png\\|gif\\|tiff?\\|p[bpgn]m\\)\\'" . no-conversion)
 ("\\.pdf\\'" . no-conversion)
 ("/#[^/]+#\\'" . emacs-mule))


Documentation:
Alist of filename patterns vs corresponding coding systems.
Each element looks like (REGEXP . CODING-SYSTEM).
A file whose name matches REGEXP is decoded by CODING-SYSTEM on
reading.

The settings in this alist take priority over `coding:' tags
in the file (see the function `set-auto-coding')
and the contents of `file-coding-system-alist'.

You can customize this variable.