[Users] Getting Claws Mail to remember external application for 'open with ...' dialogue

[Paul]

On Wed, 1 Nov 2017 12:31:46 +0000
John Hostler <john.hostler at ymail.com> wrote: 

> Generally it works very well but there is one thing I find
> tiresome, I'm not sure if it's a bug, I hope someone can advise me.

It's not a bug. First read this FAQ entry:
http://www.claws-mail.org/faq/index.php/Interface#How_can_I_change_the_key-bindings_.28hot-keys.29_in_Claws_Mail.3F

The menu item you want to change is
/View/Message part/Open

with regards

Paul