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  • How would you have done it? What exactly is your surprise? Commented Apr 27, 2013 at 16:47
  • Well for instance, Android packages are just a .zip file with the right structure (just like a compressed .app). I understand that the above structure probably appeared progressively, but 4 levels of imbrication seem a bit much to me. Which is why I asked for any historical hint. Commented Apr 28, 2013 at 12:03
  • zip is the same as gz and cpio (or gz and tar) combined actually Commented Apr 28, 2013 at 14:12