>>>That's an imaginative but (to me) nasty-sounding hack. My guess is it would fail if the XLSX was password-protected, even if it might otherwise work. I understand XLSX is a collection of XML files in a ZIP container (but not compressed?). Even if it's not compressed, if the ZIP container has a checksum then directly modifying its contents without updating the checksum might cause issues.
>
>Yes, xlsx is zipped unlike xls, so while you could unzip/zip xslx (which I recall your xslx class does automatically) we didn't try that.
Are you still using XLS? It's a malware vector, it's been deprecated for over 10 years, Excel itself doesn't like it and no sane mail system will allow them as attachments.
Regards. Al
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