[galaxy-user] file upload renamed

When uploading a file using “Get Data” it seems the file is renamed to dataset_’id’.dat in ~/database/files/000/. Is it possible for the file to keep its name rather than being renamed? It seems this is being done because of the line ${output.dataset.dataset.id}:${output.files_path}:${file_name} in the upload.xml file. But I don't know where in the code it gets ${file_name} from. Any ideas how i change this to get the correct name of the file being uploaded? Neil