[Evolution] How to edit list of applications to open attachments

[W Van Snyder <van snyder sbcglobal net>]

I can't find anything in the user manual that explains how to edit the
list of applications that could be used to open attachments.

I suspect that's actually the purview of whatever window manager is
running evolution, but it would be helpful to have references that lead
me to details for each one, and some way to find the references.  The
index page for the evolution manual has almost nothing about reading
mail.