cannot export to HTML from Crystal Viewer

Hello! All:

I am using the viewer in a .NET application developed in VS 2010. The export button is active and all the types are available except HTML 4.0 The .NET Crystal Reports runtime was installed on the target computer via the .msi in unattended (passive) mode which may have installed all the export drivers including HTML.

Is there any configuration to be done to the viewer in my code?

Please help.

Thanks

Lawrence