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一個偷跑的SP1更新檔竟然有6XX MB

This is the Windows Vista Service Pack 1 Build 6001.16633. Think of it more as a pre-beta build of SP1 than an actual beta build. It is also a standalone update pack that can be installed in any edition of Vista RTM and is not a fully integrated SP1 ISO unlike the previously released 6001.16549.
Full Build tag is: 6001.16633.070803-1655