http://bugs.winehq.org/show_bug.cgi?id=27133
--- Comment #3 from Sam Morris sam@robots.org.uk 2011-05-11 12:09:38 CDT --- I've opened both MSI files in Orca https://encrypted.google.com/url?sa=t&source=web&cd=1&ved=0CBgQFjAA&url=http%3A%2F%2Fmsdn.microsoft.com%2Fen-us%2Flibrary%2Faa370557(v%3Dvs.85).aspx&ei=osHKTcLKJYe0hAewmOSoAg&usg=AFQjCNGXkoXpbTe5rXWb-zEuM71z1Ia8lg and eyeballed them for differences.
The only difference I can see is in the MsiFileHash table; in the installer generated by Wine, The HashPart1/2/3/4 columns all have the value 0 for both files.
I also extracted the embedded sample.cab file and found that the contents of file1.txt was used for file2.txt there as well.