On 2016-09-19 15:15, John Laubenheimer wrote:
Previous releases (up to k4t4949a) would unzip using Windows Explorer/File 
Manager, and did not require the user to install the 7-Zip utility, which is 
not permitted in many corporate environments. Is there some reason that the 
standard PKZIP format can no longer be used? The last release of the z/OS 1.13 
manuals was much larger, and still did not require 7-Zip. I tested this myself; 
the .zip file is only about 12 percent larger than the .7z file. In any event, 
the download should use a suffix of .7z (and NOT .zip) if IBM is truly 
delivering the file in 7-Zip format.


From http://www.7-zip.org/ :

"Supported formats:

    Packing / unpacking: 7z, XZ, BZIP2, GZIP, TAR, ZIP and WIM
Unpacking only: AR, ARJ, CAB, CHM, CPIO, CramFS, DMG, EXT, FAT, GPT, HFS, IHEX, ISO, LZH, LZMA, MBR, MSI, NSIS, NTFS, QCOW2, RAR, RPM, SquashFS, UDF, UEFI, VDI, VHD, VMDK, WIM, XAR and Z."

"Compression ratio results are very dependent upon the data used for the tests. Usually, 7-Zip compresses to 7z format 30-70% better than to zip format. And 7-Zip compresses to zip format 2-10% better than most of other zip compatible programs."

7-Zip *can* create zip format archives. I use it to do so on a regular basis. There is absolutely nothing wrong with using 7-Zip to create zip archives. If IBM happened to use 7z format instead of zip format, and named the resulting file something.zip, then they made a mistake.

You can use 7-Zip to show the archive type, for example:

7z l -slt F:\winzip\example.zip

You might want to redirect the command output, since you are dealing with a large archive, and the command output will likely be large.

--

Regards, Gord Tomlin
Action Software International
(a division of Mazda Computer Corporation)
Tel: (905) 470-7113, Fax: (905) 470-6507

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