Since macOS does not natively support .RAR files, you must use a third-party utility to access the M3U playlist inside.
Use a trusted app like The Unarchiver or Unzip One from the Mac App Store. Download MAC M3U rar
Once extracted, your M3U file is essentially a text-based "map" that tells a media player where to find audio or video streams. Since macOS does not natively support
Right-click your downloaded .rar file and select Open With > The Unarchiver . Download MAC M3U rar