bug#20891: emacs: Back off if .doc is not an Office document

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: stefan@marxist.se,  era+emacs@iki.fi,  20891@debbugs.gnu.org
> Date: Sat, 09 Nov 2019 21:14:52 +0100
> 
> since the Windows *.doc files are becoming rarer, perhaps that
> means that doing doc-view only on files that have the magic bytes is
> more important than it used to be

Sorry, I don't follow that logic.  I'd expect that *.doc MS Word files
becoming rarer would mean plain-text *.doc files become relatively
more important, i.e. the opposite conclusion.  What did I miss?