GtkFileChooserWidget with a specified backend. This is
especially useful if you use gtkFileChooserSetLocalOnly to allow
non-local files. This is a file chooser widget that can be embedded in
custom windows and it is the same widget that is used by
GtkFileChooserDialog.
WARNING: gtk_file_chooser_widget_new_with_backend has been deprecated since version 2.14 and should not be used in newly-written code. Use gtkFileChooserWidgetNew instead.
gtkFileChooserWidgetNewWithBackend(action, backend, show = TRUE)actionbackendGtkWidget] a new GtkFileChooserWidget