ATTENTION:
As of Dec 31, 2017, PC-FX has been updated to use Libretro API to handle the game’s save file. For most cases, the savefile should be compatible with your older saves. Here’s how to make it work.
-Make a backup of your PC-FX’ *.sav files from your save directory.
-Rename the file extension from .sav to .srm, keep the original filename intact.
-Re-launch retroarch and start PC-FX core