If you converted these from the joshw.info (
https://vgm.hcs64.com/) archives as it appears; it's probably worth noting what I found when inspecting your effort's results.
The Movie folders' M4A files are pretty low bit-rate (Two of them from separate games measured at 157kbps & 159kbps) and do not need the WAV conversions as it simply up-scales them to a format approximately 10x their native quality & takes a lot of unneeded storage.
Additionally, taking a look at the WAV conversions from the .SCD files via Spectrogram (Audacity's for disclosure), while samples I inspected from newer games as Birth by Sleep & 358/2 Days were maintaining 21k (About as high as I see most MP3 320kbps files) and as low as about 18k for samples from Kingdom Hearts II Final Mix (Just higher than the MP3 128kbps files I typically have from unofficial SoundCloud file downloads). The simple point I'm trying to get to is; Unless WAV was your only playable format option for your extraction process (And I haven't encountered the .SCD format myself, so it might well have been for all I know), I think the WAV is 'too good' a format to have converted to when OGG, MP3 or other lossy/compressed formats may have been suitable choices & far friendlier on storage.
Do not think me ungrateful though. Trying to get one's hand on this series' incredible music is not easy (I don't believe much if any of it is available via official digital outlets, and I think the physical copies only ever got sold in or around Japan which are no small price to acquire), and having the in-game music files in a playable format is a grand thing indeed!