FileChooser.setLocalOnly

Sets whether only local files can be selected in the file selector. If local_only is true (the default), then the selected file or files are guaranteed to be accessible through the operating systems native file system and therefore the application only needs to worry about the filename functions in #GtkFileChooser, like [gtk.file_chooser.FileChooser.getFilename], rather than the URI functions like [gtk.file_chooser.FileChooser.getUri],

On some systems non-native files may still be available using the native filesystem via a userspace filesystem (FUSE).