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That was then, this is now.
WZ was around long long before many decent freeware/OSS compressors with nice UIs were available.
And FWIW, WZ still has a nicer UI and workflow than 7-ZIP or the built-in Windows ZIP, IMHO.
[edited by: DamonHD at 6:21 pm (utc) on Sep. 25, 2006]