GtkFileChooserDialog with a specified backend. This is
especially useful if you use gtkFileChooserSetLocalOnly to allow
non-local files and you use a more expressive vfs, such as gnome-vfs,
to load files.
WARNING: gtk_file_chooser_dialog_new_with_backend has been deprecated since version 2.14 and should not be used in newly-written code. Use gtkFileChooserDialogNew instead.
gtkFileChooserDialogNewWithBackend(title = NULL, parent = NULL, action, backend, ..., show = TRUE)titleNULL. [ allow-none ]parentNULL. [ allow-none ]actionbackend...GtkFileChooserDialogGtkWidget] a new GtkFileChooserDialog