New Post: Multi part extraction

At the moment I initialize the rar archive by using:

SharpCompress.Archive.Rar.RarArchive.Open(stream);

whereas stream is a stream to the file. How do I "feed" this class now with the other streams of the other parts? I did not see a function for this, and it can only be initilized by submitting a stream object.
It will be nice, if you can give me an example for extraction a multi part rar archive.
Thanks,
Roland

PS: I am using the lib via WinRT with the WP7 build.