Presumably since https://bugs.freedesktop.org/show_bug.cgi?id=71827 was resolved in 1.3, any OpenPGP armored public key (e.g. exported with "gpg --armor --export $KEY_ID" is recognized as application/x-iwork-keynote-sffkey.
The ideal behavior IMO would be that the "BEGIN PGP PUBLIC KEY BLOCK" magic has precedence over the .key file extension.
on Mar 27, 2017 at 12:38:47.
(provided by the Example extension).