Source Reference:

• Component: bbPress :: bbp-admin

  File: /bbp-admin/bbp-admin.php :: Trac Source Line: 332

  		require_once( ABSPATH . 'wp-admin/includes/import.php' );
  
  		// Load our importers
  		$importers = apply_filters( 'bbp_importers', array( 'bbpress' ) );
  
  		// Loop through included importers
  		foreach ( $importers as $importer ) {
  
  			// Allow custom importer directory
  			$import_dir  = apply_filters( 'bbp_importer_path', $this->admin_dir . 'importers', $importer );
  
  			// Compile the importer path
  			$import_file = trailingslashit( $import_dir ) . $importer . '.php';
  
  			// If the file exists, include it
  			if ( file_exists( $import_file ) ) {
  				require( $import_file );
  			}
  		}