it’s been 20 years that I saved metadata in WAV files. For Windows downloaded audioshell id3 tag editor.
AudioShell is a freeware MS Windows Explorer shell extension plugin which allows you to view and edit music file tags directly in Windows Explorer. AudioShell supports MP3, WMA, Apple iTunes AAC/M4A/M4P, MP4, MPC, Monkey’s Audio, OGG and FLAC files.
ALL the metadata including all the tags that come to mind and even the cover, etc.