Paul Gilmartin wrote:


Thanks for your quick action.  A few thoughts:

o "Admits" is a slightly biased word.  7-Zip is not the problem.  By experiment 
(a
  scientific sample of one test case) it works fine if one chooses the right 
options.


This is correct. 7zip is not the problem. The problem is the end user's unzip application. The zip specification has been extended over time to support additional compression methods. See https://support.pkware.com/display/PKZIP/APPNOTE and https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT. Section 4.4.3.2 has a quick summary of the feature versions. The current PKzip program will unzip the doc file created by 7zip. There is also a free windows PKunzip client that will unzip it. Winzip 18 will not unzip it. YMMV.

Alan

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