(To widetrack regarding this exact issue and question directly above, here's a solution for you)
I know it's about a whole month later, but just in the small case you haven't yet found the answer, or someone else is asking, I posted about this exact thing, once I finally figured it out and after I too struggled with this question for a few hours.
On this link, I start the thread with a question, however midway down you'll see the instructions I posted to do exactly this, "GETTING REAPER TO RECOGNIZE KONTAKT'S VST's. It will tell you what to do!
http://co.native-instruments.com/for...275#post887275
Hope this helps you or anyone else