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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