I made further tests with the following result: I took such a PDF I got
(offering only the save option) and sent it as new mail with attachment
to myself using Thunderbird.
Result: Open option available! - So it does not depend on the PDF
itself. I assume that it depends on the mailer how it packs the mime
message. Did further investigation and found the following difference:
Attachment header in mime Test-Message that is working:
Content-Type: application/pdf;
name="#31161-v1-Programmierung_RepCheck.pdf"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
filename="#31161-v1-Programmierung_RepCheck.pdf"
Attachment header in Original received mail:
Content-Type: application/octet-stream;
name="#31161-v1-Programmierung_RepCheck.pdf"
Content-Transfer-Encoding: base64
Content-Description: #31161-v1-Programmierung_RepCheck.pdf
Content-Disposition: attachment;
filename="#31161-v1-Programmierung_RepCheck.pdf"
It looks like a difference in specified Content-Type. The original mail
I got, was produced with MS Outlook 2007.
HTH.
--
Some attchments (.pdf, .xlsx) don't have open dialog just save dialog
https://bugs.launchpad.net/bugs/593459
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