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We've recently started encountering a lot of zip files which compress individual objects using the "Deflate64" algorithm, which is some old PKWARE extension that Microsoft platforms recently started using when generating large zip files. It would be very cool if Rubyzip could support this algorithm natively. The wikipedia page calls Deflate64 a "proprietary" algorithm, although I can't find any evidence that PKWARE ever patented it, and it just changes three constants in DEFLATE. I know that zlib doesn't support it, so this would be a big lift, but there are a smattering of open source implementations: