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Using Preferred Applications is not as precise and sometimes malfunctions. Using gio gets the job done but may not be the best recommended technique and using xdg-mime also works and is less distribution or desktop manager specific.Using Preferred Applications is not as precise and sometimes malfunctions. Using gio gets the job done but may not be the best recommended technique and using xdg-mime also works and is less distribution or desktop manager specific. Each option will edit the ~/.config/mimeapps.list within the user's own home directory. Although mimeapps.list could be edited manually using a text editor however this practice is discouraged due to very specific syntax required and bypasses error checking. Depending on factors regarding your installation, which of these options works best for you is unknown, however, one of these options will work.