Subj : Re: PKZIP for Win 7
To   : Alan Zisman
From : Dale Shipp
Date : Thu Sep 17 2015 23:08:02

 -=> On 09-17-15  11:44,  Alan Zisman <=-
 -=> spoke to Mark Lewis about PKZIP for Win 7 <=-

 AZ> I've got a new HP Stream 11 - shipped with Win 8.1 and has been
 AZ> upgraded to  Win 10. It came with 7-Zip pre-installed, which seems to
 AZ> be  working just fine with these newer Windows version.

It works fine for compressing files that one might later want to
decompress with 7Zip.  However, if I use it to compress my mail packets
for sending upstream, I am not sure that the receiver will be able to
decompress -- especially if he uses only PKZIP.

 AZ> However, I'm curious what Dale means by 'PKZIP format' - is 
 AZ> he referring to something other than standard *.zip 
 AZ> archives?

If you look at a compressed archive with a hex editor, you will see the
first few characters that define the compression algorithm used.  For
PKZIP, the first two characters are PK (and then some other stuff).  For
7Zip, the first two characters are 7Z.

 AZ> If it's just a standard *.zip file, no additional software 
 AZ> is needed - either to unzip or to create a new compressed 
 AZ> *.zip file - Windows for quite some time has included 
 AZ> support for both unzipping and compressing - though it can 
 AZ> be a bit awkward and non-intuitive.

There are a number of compression programs and algorithms.  PKZIP, 7ZIP
and RAR to name a few.  It is not in windows that I am concerned about.
It in preparing mail packets for sending to my uplink.

                               Dale Shipp
                  fido_261_1466 (at) verizon (dot) net
                              (1:261/1466)



.... Shipwrecked on Hesperus in Columbia, Maryland. 23:14:12, 17 Sep 2015
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