Fedora - Change default apps

When you open a file with a file manager, the file manager needs to

detect the filetype:
- via the filename: by lookup the table
- via the file signature: with map the file signature's Magic Bytes¹ to ta MIME type
choose the right application for that file.

Open file from CLI

In the CLI, to open a file, you:

decide the application before the file; then invoke that specific application with the file path as an argument.
only needs to decide which file to open; then let another application open that file in your preferred application.

	`xdg-utils` (Default in Linux: Fedora, Ubuntu)	`handlr`
Open a file or URL in the user's preferred application.	`xdg-open`	`handlr open`
Query & manage MIME types	`xdg-mimes`	`handlr` `list`/`set`/`unset`...
	`update-mime-database`

The default terminal is Fedora is gnome-terminal, for now you can't change it.

XDG - Cross-Desktop Group - the brand of specifications² published by freedesktop.org for interoperability between desktops.

Some of the widely-used specifications:

Desktop base directories (basedir): how desktops should locate files, such as config files or application data files.
Desktop entries (.desktop): files describing information about an application such as the name, icon, and description

For more information, see