The best Winamp clone for macOS is still Re:AMP https://re-amp.ru/
If you want the original Winamp experience with full support of M3U playlist then don't go further than Re:AMP
If you want the original Winamp experience with full support of M3U playlist then don't go further than Re:AMP
About 15 years ago I came across some plugin dll files that added flac support.
The only issue I ever run into is some non ascii characters in ID3 tags make that file unplayable. But winamp is perfectly capable of editing them.
It's even pretty good in the high dpi monitors because Ctrl-D enables "Double size" mode on the main window and equaliser. And the playlist window has customisable font sizes.