Similar to this question, I have some applications (Calibre, texdoc) open PDFs with Mendeley. Opening PDFs from Thunar, Thunderbird, Firefox etc. opens evince, the expected default.

It seems that those applications use xdg-open since:

$ xdg-mime query default application/pdf

I tried to find where this comes from but was unsuccessful; I fixed it with

xdg-mime default evince.desktop application/pdf

The question remains: where did xdg-open get the idea that Mendeley should be the default PDF viewer from?

I'm using Ubuntu 16.04 with i3 4.11. xdg-open is at version 1.1.0 rc3.

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