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 ...
FLStudio 9 and has audio files (vocals) in the playlist which have been edited with Newtone. When I tried to load the project (from a ZIP file) into FLStudio 20, it will load all of the audio files ...