If you can email the file and it opens without this warning then the file at that point is sound. Perhaps the code you're using to present this via a URL/link is causing an issue, or it could be totally unrelated to perl. How do I post a question effectively?, provide a short example which can replicate the problem.

In reply to Re: Excel-Writer-XLSX : Excel file with warning messages by marto
in thread Excel-Writer-XLSX : Excel file with warning messages by rajan

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