[Bug 1834869]

[Gerhard-p7]

For me the solution was in the directory /etc/xdg/menus

As there Digikam was searching for an file applications.menu which
wasn't available there.

I symbolic linked the file kde4-applications.menu t0 applications.menu
which solved the problem. The "open with" menu was filled with the
expected applications.

so:
cd /etc/xdg/menus
sudo ln -s kde4-applications.menu applications.menu

Worked for me.

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https://bugs.launchpad.net/bugs/1834869

Title:
  applications.menu missing

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