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Linux Mint with the Cinnamon desktop has a utility to easily set what application opens as a default for each file type or file extension (extension does not exclusively determine file type as this is not MSDOS). As an example the default graphical file manager for Cinnamon is Nemo. This can be easily altered to an alternative by the user.Linux Mint with the Cinnamon desktop has a utility to easily set what application opens as a default for each file type or file extension (extension does not exclusively determine file type as this is not MSDOS). * Preferred Applications - the Mint Cinnamon simple and basic graphical mine type management utility * gio - view mine type file associations from the shell and set the preferred application for each file typeSet the default environment file manager by: System Settings -> Preferred Applications -> (File Manager) Typical users will find the Preferred Applications graphical utility will meet their needs. However, it is both somewhat buggy and does not provide configuration for each file type. It is really more like something Microsoft would do than what should be included in a Linux desktop environment. You have the ability to use a more precision application mine type management using the gio command rather than the graphical Preferred Applications utility. As an example the default graphical file manager for Cinnamon is Nemo. This can be easily altered to an alternative by the user using the Preferred Applications graphical utility. Set the default environment file manager by: System Settings -> '''Preferred Applications''' -> (File Manager) Solution Confirmed. The avi files now open on smplayer