Re: doc-view and mailcap

[Richard Stallman]

    For what it's worth, w.r.t attachments, I see no problem with Gnus's
    attachment and doc-view support: if viewed internally the attachment will
    use doc-view-mode and if used externally it'll use whichever program you
    prefer (xpdf, xdvi, gv, evince, ...).

I don't understand the "ifs" in the last sentence.  What condition
would choose between those two methods