In case you do not own the full version of KONTAKT 5, there is a free KONTAKT 5 PLAYER version which allows you to use all the features of a KONTAKT-based Instrument. the ABBEY ROAD DRUMMERS, the SYMPHONY SERIES or pianos like UNA CORDA) are designed to be used with the KONTAKT 5 Sampler.
Most Native Instruments sample libraries (e.g.