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I am running openbox and so do not have access to standard Ubuntu control panel, but must set everything from the terminal. When I download an image in chrome and click open, it launches xdg-open which then launches an arbitrary program (it resorts to Internet Explorer on wine if I uninstall those programs).

How do I control which program is loaded for an image of type .jpg (and others)?

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  1. Run the command nano ~/.local/share/applications/mimeapps.list (to set for your user only) or sudo nano /usr/share/applications/mimeapps.list (to set for all users).
  2. Find the mime type of the file you want to change (.jpg is image/jpeg). You can find the mime type with the command file --mime-type -b filename
  3. Replace (or add) the line so it reads image/jpeg=eog.desktop (replacing image/jpeg with the type and eog.desktop with the .desktop which you want to use to launch the program.

Note:
If you are using /usr/share/applications/mimeapps.list, you may need to create it see here: Default Applications - ArchWiki

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