E/W Bossendorfer 290
This uses Kompakt, not Kontakt.
Kompakt is PPC only. If you want to use this on an Intel based MAC you can only run this with the full version of Kontakt 3.
As Erik pointed out, you still need to install, registered and run once in Kompakt before Kontakt can use it.
I have 2 of EW products that use Kompakt and Intakt as there players. Hardcore Bass and Stormdrum 1 and I had to install, register and run once before I could use these sampled libraries in Kontakt 3.
A simple copy of each of the PLIST files won't work because some copy protection schemes use your hardware as an ID to put in there PLIST files.
If this is true what Erik mentioned, PPC AU componets will not be seen in Logic 8 on an Intel based MAC.
Just install, otherwise if you post any problems after your copy make sure you add in your post that you did a copy and not a proper install.