I've just set up mu4e, and have noticed that when opening an attachment with the o key it will open with MuPDF. Pressing A w to open-with doesen't seem to help either, since it prompts for an external shell command.

I'd like to open PDF attachments with pdf-tools instead of MuPDF, or at least be able to open with with the open-with function mapped to A w

  • For me, pressing A e, for "in-emacs", opens the attachment in PDFView. Have you tried that? Also, o e works exactly the same.
    – Heikki
    Mar 17, 2019 at 8:55
  • You're right! I just tried it with another PDF file, and it worked out the box. I think the test PDF my friend sent me was missing the file extension, and so Emacs was opening the PDF as a text file.
    – Vent
    Mar 17, 2019 at 13:55

1 Answer 1


Recapping discussion in comments: Pressing A e, for "in-emacs", opens the attachment in PDFView. o e works exactly the same.


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