-=> 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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    * Origin: Owl's Anchor (1:261/1466)