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Try FilZip. Or any UNIX unzip.
Why is it zipped in such a cruel way? Filzip also does not appear to work correctly in first try. it It only unzip unzips a "WPKG Client 1.0 rc1" file without any file endings. By renaming it to .zip and unzipping it again some files appear. But if WPKG is fo Windows it should be decompressable in a normal way ( Winzip also does not like the file). -> improves usability