Whatever the images you're posting are, they don't display on this forum and, hence, I can't see what they're supposed to display. Thus I have no idea what the messages in posts 1 & 3 are.
A file with a line like:
Content-type: application/vnd.ms-excel
simply tells a web browser to treat the content as an Excel file. For Excel 2007 & later xlsx files, so too does:
Content-type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
That said, unless the file is being named by Excel, I doubt there's anything that can be done about that from the Office side of things; it's entirely under to control of the software that's creating the files.
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Cheers,
Paul Edstein
[Fmr MS MVP - Word]
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