The variable `mm-inline-override-types` is overridden in `notmuch-show` to "stop application/* parts from being displayed".

This works well, however it means in other places the part *is* expanded. For example when `(notmuch-show-refresh-view)` is called (after any refresh) or even when `notmuch-show-reply-sender` is called.

To see this behaviour make sure that `mm-inline-override-types` is nil and open a message with an `application/zip` part. The part is not expanded as expected.
Call `(notmuch-show-refresh-view)` and notice how the part is expanded (on my Emacs, I even get a warning: "These default coding systems were tried to encode the following problematic characters in the buffer ‘ *temp*-926949’").

I solved this in my config by setting `mm-inline-override-types` to `(list "application/*")`, but I think notmuch could be more consistent.

Best regards,
-- Al 
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