Gtk.FileChooserWidget is a widget suitable for selecting files. It is the main building block of a Gtk.FileChooserDialog. Most applications will only need to use the latter; you can use GtkFileChooserWidget as part of a larger window if you have special needs.

Note that Gtk.FileChooserWidget does not have any methods of its own. Instead, you should use the functions that work on a Gtk.FileChooser.