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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Updating dired-guess-shell-alist-default
Date: Wed, 08 Jul 2020 05:25:33 +0300
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To: Stefan Monnier <monnier@iro.umontreal.ca>
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In-Reply-To: <jwvimezhzxx.fsf-monnier+emacs@gnu.org> (message from Stefan
 Monnier on Tue, 07 Jul 2020 15:48:26 -0400)
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: "Philip K." <philip@warpmail.net>,  emacs-devel@gnu.org
> Date: Tue, 07 Jul 2020 15:48:26 -0400
> 
> > So you suggest to use xdg-open if it's available, and otherwise do
> > what? leave the current associations intact? or something else?
> 
> Actually, that might be a good&simple solution, yes.

If the current associations are way off, that would be simple but
somewhat wrong, IMO.

> > Does xdg-open invoke different programs than what we have now in
> > dired-guess-shell-alist-default?
> 
> It all depends on the system you have (and the tools that are
> installed), but yes, xpdf and xloadimage seem rather outdated (they
> still exist but are much less popular than they once were).

What is used in their stead?

> > Is there a way to know what it invokes for each file type?
> 
> Do you mean for use to know statistically what it uses most often,
> or for Emacs to determine it at runtime?

The former.