Since gnupg tools really don't care about the extension, just the header . . .
Since the *.asc (ascii armor version for posting on 'net) is indeed a text file . . .
Until the forum post attachment filter is fixed to allow *.asc, just rename them *.txt - that should work for now anyway.
The end-users only need one copy of the author's gpg key -
Which they can get here:
http://drpbox.knetconnect.com/mr-keys/
Those are the "ascii armor" version of each author's public key.
@twobob: When fixing up the top post attachements you can remove that key file from the signatures zip file - no longer needed there now. thanks.