>PKZIP supports compression of files over 9 exebytes in size.

We went from PKZIP to ZIP/390, because of cost and support issues.
ZIP/390 comes from DATA21 (www.data21.com).

Both companies support lines are only open 9-5, M-F (local time).
DATA21 is in California, and PKZIP is in Phili (I believe).

>I am sure that there are others as well.

I cannot speak to file size.
We rarely had files over 500 Mb.

The only 'flaws' I've found in ZIP/390:
1. You cannot add a file to an existing archive.
2. You cannot compress VSAM; this is an added cost feature in PKZIP.

The other problem with PKZIP/MVS, beside the ones I mentioned above, is 
archiving PDSE's.
This is automatic with ZIP/390 and a cost feature with PKZIP.

-
Too busy driving to stop for gas!

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