This is a 14MB compressed windows help file containing the vtk online manual from here: http://www.kitware.com/vtkhtml/vtkdata/html/classes.html Download a copy from: http://www.driveway.com/share?sid=930306bb.fd1e8&name=Business&view=0 I'm using it on Win2000 ... it might be usable on Win98SE as well.