Sources history of the 7-Zip Extra
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  Version 4.33 beta           2006-02-05
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    - Compressing speed and Memory requirements were increased.
      Default dictionary size was increased: Fastest: 64 KB, Fast: 1 MB, 
      Normal: 4 MB, Max: 16 MB, Ultra: 64 MB.
    - 7z/LZMA now can use only these match finders: HC4, BT2, BT3, BT4

  
  Version 4.27                2005-09-21
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   - Some GUIDs/interfaces were changed.
     IStream.h:
       ISequentialInStream::Read now works as old ReadPart
       ISequentialOutStream::Write now works as old WritePart
