FLStudio doesn't decompress the wave files when you first install the program?
After some research the IL website explains that: "Many .WAV files included with FLStudio are .OGG encoded .WAV files. These files require the Vorbis ACM CODEC ...
Most of Useful VST comes with .NKI extension types so i request the FL Team to make it support .NKI format too so that we doesnot have to rely on other vst like Kontakt. ...