Hi, I think there have been several incarnations of the Peter Siedlaczek samples.
The original Akai discs (which require a Sampler, either hardware or software, to play the samples), then there was a Giga library, and the most recently the Peter Siedlaczek Complete Orchestra in the Kontakt Player 2 format.
The answer to your question may depend on whether you have the full version of Kontakt2 or 3 (not the Kontakt Player2). The full Kontakt can play the Akai samples. John