Cannot play .wav sample files with Sonivox instruments

I cannot play the samples (Wav files) for any Sonivox instrument I bought (singles, Orchestral Companion Strings,Orchestral Companion Brass). When trying to open in my mp3 player, there is an error message: Unable to play this file - it has an unsupported format or is corrupted. Plugins are correctly installed and authorized and everything else works fine in my DAW. What is the use of these samples and how to utilize them?
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