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DOCX, PPTX, XLSX and EPUB all start with the same magic bytes — auto-detect means asking the ZIP what it is

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When I added auto-detect to my universal document converter, I assumed file extensions and Content-Type headers would carry the weight. Both lied to me within the first week. A contract arrived named contract.pdf. The extension said PDF, the upstream header said application/pdf. My PDF parser choked on byte zero: the file was actually a DOCX.

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DOCX, PPTX, XLSX and EPUB all start with the same magic bytes — auto-detect means asking the ZIP what it is · ShortSingh