Both companies recently changed their implementations of the .zip format. In May, WinZip released a beta version of WinZip 9 that alters the .zip format. PKWare made its changes earlier, but recently posted specifications detailing its changes to the format.
Read more: [URL=http://www.idg.net/ic_1321254_9677_1-5043.html]PC World[/URL].
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