(VikDataSourceCheckExistenceFunc) NULL,
(VikDataSourceAddSetupWidgetsFunc) datasource_file_add_setup_widgets,
(VikDataSourceGetCmdStringFunc) datasource_file_get_cmd_string,
+ (VikDataSourceProcessFunc) NULL,
(VikDataSourceProgressFunc) NULL,
(VikDataSourceAddProgressWidgetsFunc) NULL,
(VikDataSourceCleanupFunc) datasource_file_cleanup,