Sorry. Mixed up the V4 and V5 registry key. I meant that you need to create a new registry key for the V4 plugin. The registry key information provided in the product documentation for the V4 plugin is also erroneous. There are some other posts in this forum describing that issue in detail, like for example this one:
http://www-10.lotus.com/ldd/nd6forum.nsf/55c38d716d632d9b8525689b005ba1c0/96cec8f5ec73012785256c47006a638d?OpenDocument&Highlight=0,plug-in,finally