From mboxrd@z Thu Jan  1 00:00:00 1970
From: Kyle Meyer <kyle@kyleam.com>
Subject: Re: Refile: refile to any open file.
Date: Thu, 14 Aug 2014 00:45:22 -0400
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Nick Dokos <ndokos@gmail.com> wrote:
> jorge.alfaro-murillo@yale.edu (Jorge A. Alfaro-Murillo) writes:
[...]
>> Perhaps you should return instead only the org mode files that are
>> opened, something like this:
>>
>
> Excellent idea: refiling to an arbitrary non-org-mode file will either
> skip the file (if you are lucky, in which case you just pay a
> performance penalty) or it will try to use it in which case you'll end
> up with an error. There is no point in including arbitrary files into
> the refile list.
[...]
> It might be better to check the major mode of the buffer, rather than
> its filename: it is not necessarily true that foo.org is an org-mode
> file, or foo.txt is not.

There's a built-in Org function that does this.

#+begin_src elisp
  (org-buffer-list 'files)  
#+end_src