Thanks, 1nickt. Thinking this through to see if I can use that new info to my benefit. If not, its definitely useful info for the future. That said, technically Excel is not involved. The source XLSX file comes from one website. I have to process it into a CSV file for upload to a different website. So the UTF-8 CSV is fine. I just can't figure out why the encoding in my output file gets munged when the same Perl modules produce good UTF-8 output in another use case.

If I have to, I'll just pre-process all the XLSX files with xls2csv and then use the CSV files as the source data from my script. I was just trying to avoid that extra step. Since xls2csv is just a Perl script itself, I should be able to do all the work inside one script.

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