Title of the native, or %NULL
Transient parent of the native, or %NULL
Open or save mode for the dialog
text to go in the accept button, or %NULL for the default
text to go in the cancel button, or %NULL for the default
a new #GtkFileChooserNative
ConstructionException GTK+ fails to create the object.
3.20
Creates a new #GtkFileChooserNative.