In T4449#124252, @aheinecke wrote:

Or you can write it directly to the config in %APPDATA%/gpg-agent.conf

Curious as to whether there's been any update on this. GPG4Win is the only approved whole email + attachment encryption solution on this end, and we're having trouble with inline images showing up as attachments only in Outlook 2016 (using GPG4Win 4.0.2). Of course, as you said, at least the attachment isn't being lost; however it does make reading rich emails more difficult.