Python 3.8.6 openpyxl.load_workbook('Config/Test_Sheet2.xlsx') is giving error File is not a zip file

Question

import openpyxl
try:
    WB = openpyxl.load_workbook(\'Config/Test_Sheet2.xlsx\')
    WB.save(self.filename)
    WB.close()
except Exception as e:
    print(e)