use file extension instead of sniff for registering file

        outputs = []

        for item in incoming.get("series", []):

            name = item.get("input", None)

            file_type = "_sniff_"

            file_type = os.path.splitext(name)[1][1:]

            dbkey = "?"

            uploaded_dataset = Bunch(type="file", name=name, file_type=file_type, dbkey=dbkey)

            tag_list = []