How to download an excel base64 content in file format using Desktop studio.

Hi,

I am unable to download an excel Base64 content in file format(.xlsx) in desktop studio.

I tried this way:

'window.location.href = data:application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;base64 + "Base64String"';

Could you please guide me if anybody knows..

Thanks in Advance.