Open an Excel file

[Friend]

Hi all,
I am trying to open an excel file (LibreOffice) with the following code:

import openpyxl
wb = openpyxl.load_workbook(r'C:\Users\user\Desktop\Python\example.xlsx')

but i get the follwing error:

Error:
KeyError: "There is no item named '[Content_Types].xml' in the archive"

Can someone please tell what this error means and to read my Excel file.

Thanks