Ok I got it to open. Put both files into one folder. Then click on part 1 to open. When it asks you about the files, click the first one - files from this rar. Then you will see a box asking for the second rar file. Just direct it via browse to the second file. After that the whole book should open!!!!
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Well this is very sad, but none of my extraction programmes on none of my machines can extract these files. It seems that part 2 is damaged. Sad. Why does this get a "good" stamp?