Monte Davidoff added the comment: Serhiy, thank you for the correction and the additional information. I tried reading a zip file larger than 4 GiB with allowZip64=False, and it worked, so it looks like allowZip64 only applies to writing. I suggest we fix the inconsistency in the documentation as follows: (1) In the description of the zipfile.ZipFile class, revert the change back to: "If allowZip64 is True (the default) zipfile will create ZIP files that use the ZIP64 extensions when the zipfile is larger than 2 GiB." (2) Change the second paragraph in the zipfile module documentation from: "It can handle ZIP files that use the ZIP64 extensions (that is ZIP files that are more than 4 GiB in size)." to: "It can handle ZIP files that use the ZIP64 extensions (that is ZIP files that are more than 2 GiB in size)." ---------- _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue29013> _______________________________________