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From: Ralf Brown aill > # .docx, .pptx, and .xlsx are XML plus other files inside a ZIP # archive. The first member file is normally "[Content_Types].xml". # but some libreoffice generated files put this later. Perhaps skip # the "[Content_Types].xml" test? # Since MSOOXML doesn't have anything like the uncompressed "mimetype" # file of ePub or OpenDocument, we'll have to scan for a filename # which can distinguish between the three types EFTA00502754
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