MSB wrote:
.. Finally, you could open an InputStream onto the file and examine the first few bytes - I think it is safe to assume that the xml header would be the first thing you read from an OpenXML based file.
Goodness, no! :-) An xlsx file (like a docx file and I suppose a pptx file) is actually a zip archive. Try opening it with winzip or your favorite zip-file reader and you'll see ("zip -T sheet.xlsx"). Inside you'll see XML files, each of which should have a nice XML header. I suppose you could reimplement the magic-number check for a zip file done by a unix/linux machine's "file" program, maybe that's what POI's WorkbookFactory does under the covers.
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