In this section you can download ClassGenerator, which is a stand-alone VB 6.0 executable. This actually means that VisualBasic 6.0 runtime library is required.
It seems that Windows XP SP2 doesn't contain the COMDLG32.OCX file (I don't know whether later Windows versions include this ActiveX control or not). For more information on getting this file please follow this link. You have to register the ActiveX control in order to be provided to your system.