Spread Sheet Styling not opening Microsoft Excel

Hi ,
We created spreadsheet with styling for headear, footer etc.
After dowloading and opening in Microsoft Excel, showing some error and not applying the styles.
Kindly help us.

None of the style is applied? What was the error in MS Excel? Styles are set using apache poi API, there’s plenty of poi material and tutorials about styling. Also this tutorial shows some basic styling:
https://vaadin.com/wiki/-/wiki/-/Vaadin+Spreadsheet+Tutorial