The World Editor's import editor/manager can import single files and all the files in a directory, but it cannot import the files in a directory and all its sub-directories. w3_bulk_importer tries to fill this functionality gap. It does so by first making a copy of the map (adds a '_copy' suffix to the map's name: map.w3x is copied to map_copy.w3x), and then attempts to import the files. It also prints a trace/output of what it's doing. After the importing is done, the user should verify that the files were successfully added to the map, before continuing working on it.