Kontakt_3_Library.zip file and extract the Kontakt 3 Library.xml file to the following folders: It's possible to have these sounds loading automatically and playing back in Sibelius 5 and 6, just like the Sibelius Sounds libraries do: Kontakt 3 from Native Instruments includes a 33 GB library of sounds from Orchestral, World, Vintage, Band, Synth to Urban Beats.
597: How to use the Kontakt 3 factory library in Sibelius