[Users] Some Message Part 'Open With' Dialogs Missing 'Remember This' Option

[Paul]

On Sun, 8 Sep 2019 13:46:41 +0600
Dustin Miller <dustbiz at gmail.com> wrote: 

> Shall I file a bug for this? If so, for the 'Importance' category,
> should I go with 'Minor' or 'Enhancement'?

It's not a bug.

The 'Remember This' check box is only present for mime types that are present
in the mailcap file (either /etc/mailcap or ~/.mailcap). If the entry is
present then the application you choose to use can be remembered by writing
to ~/mailcap.

with regards

Paul