Led by
https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1250314/comments/2
, I tried 'rm ~/.local/share/zeitgeist -R', and that solved the problem
for me.
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There was a button for it, I removed the link to #26662 as duplicate.
** This bug is no longer a duplicate of bug 26662
using the filename to get the mimetype is not always correct
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