Bjørn Furuknap has done a great video on how to get starting with WSPBuilder Extensions. In the demo he shows how to replace the Cablib.dll file with a 32 bit version. This is because of a bug in the installer installing the wrong version. However now it has been fixed and it's no longer necessary to replace the file.. New version here WSPBuilder.
Bjørn Furuknap WSPBuilder demo...