11/15   What does the %u mean in my .mailcap file? RFC1524 doesn't say.
        I see it used by the RealPlayer8 installation, but it breaks
        when I try to play non-RP audio (like wav) unless I change %u to %s
        \_ No idea.  It isn't in the man pages for mailcap on two different
           systems I have.  Try the source.