This bug is actually resolved. See:
https://bugs.launchpad.net/ubuntu/+source/evolution/+bug/205999
The last comment (#70) in that bug report states that this setting will fix the
problem:
Check the option in : edit - preference - composite preferences (unsure, the
fourth) - general
Encode file
Since nobody is paying attention to this bug, and it is still a problem
for me in the latest version of Ubuntu, I will try to re-open it and
submit the information needed.
Attached is a screendump showing two almost identical email. The only
difference is the name of the attached file. One is
I confirm that this is a bug, that it has been for quite a while, and
that it still is a problem.
** Changed in: evolution (Ubuntu)
Status: Invalid = Confirmed
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Evolution mail renames attached pdf's to dat's...
https://bugs.launchpad.net/bugs/304765
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