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GUI Composer v3: Generate xlsx file for user download

Hello,

In my project, I am able to generate a csv file for the user to download without any issues, but is it possible to generate an Excel file? I would like to be able to do more text formatting, like highlighting, that the csv does not support.

I've been struggling to get this example to work in my code:

https://code-boxx.com/create-excel-file-javascript/

Thank you for your help