Nautilus click on mounted partition opens LibreOffice

I’m running a recent installation of Ubuntu 19.10. A partition mounted at ‘/media/USER/Ubuntu_17.10_x64’ doesn’t appear in the left pane of Nautilus; when I navigate to ‘Other Locations’ and click on it, LibreOffice starts and an error message pops up: ‘Access to /media/USER/Ubuntu_17.10_x64 was denied’ /usr/share/applications/defaults.list doesn’t list any relevant LibreOffice extensions as far as I…

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