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You can observe all video mine type associations from the CLI. type: cat ~/.config/mimeapps.list |grep videoTo correct the mine type association for avi we can do the following. First lets see how it is currently set. This will show the default and recommended applications for opening avi video files: cat ~/.config/mimeapps.list |grep aviIf you have several multimedia players installed you might see a longer list, otherwise it may be shorter than this output example. OUTPUT: video/avi=vlc.desktop video/x-avi=smplayer.desktop video/avi=vlc.desktop; video/x-avi=vlc.desktop; Our goal is to set so that avi defaults to open in smplayer for this example. The following command will be executed: gio mime video/avi smplayer.desktop