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NetSuite Professionals

Is it possible to generate an XLSX file from NS Suitelet? Our developer says NS supports XLS only.  Is that really the case?

It is not native to SuiteScript, but it is possible - I have done it before.
There are some libraries you can leverage to help with this.

You can also generate an XML that excel can read

<https://ursuscode.com/netsuite-tips/convert-large-netsuite-csvs-to-xlsx/>

Link isn't working but I was able to google search the same thing. Thank you!