(VikDataSourceInitFunc) datasource_file_init,
(VikDataSourceCheckExistenceFunc) NULL,
(VikDataSourceAddSetupWidgetsFunc) datasource_file_add_setup_widgets,
(VikDataSourceGetCmdStringFunc) datasource_file_get_cmd_string,
(VikDataSourceInitFunc) datasource_file_init,
(VikDataSourceCheckExistenceFunc) NULL,
(VikDataSourceAddSetupWidgetsFunc) datasource_file_add_setup_widgets,
(VikDataSourceGetCmdStringFunc) datasource_file_get_cmd_string,