current_dir = path_and_file(existing_filename, ¤t_file);
gtk_file_chooser_set_current_folder(GTK_FILE_CHOOSER(dialog), current_dir);
gtk_file_chooser_set_current_name(GTK_FILE_CHOOSER(dialog), current_file);
current_dir = path_and_file(existing_filename, ¤t_file);
gtk_file_chooser_set_current_folder(GTK_FILE_CHOOSER(dialog), current_dir);
gtk_file_chooser_set_current_name(GTK_FILE_CHOOSER(dialog), current_file);