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14th January 2010 | 09:17

#2 (permalink)

bnt

Joined: Feb 2007

Posts: 755

Likes: 26

From: Dublin, Ireland. (No, I just live here.)

Looks like something changed with WinZip 10 (and, I presume, later versions): Error message when you extract a compressed file that has a .zip file name extension on a Windows Vista-based computer: "This file was compressed using an unknown compression method"

Quote:

WinZip 10 uses a compression method that is incompatible with some versions of Windows and with earlier versions of WinZip.
...
To work around this problem, select the Maximum (portable) compression method in WinZip 10.
...

You might be able to extract it with 7-Zip Portable (which needs no admin rights to install and use)

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