No playlist file formats are recognized. No problem with a variety of music file formats: mp3, flac, m4a, wav, wma all play fine. I do have a playlists workaround. I have 8,500 music files managed using MusicBee on my PC. It will export playlists to a removable device and create a folder for each playlist. This can produce some duplicates in the file structure, but the Gravity seems to handle it fine. I can see everything by album, artist, and genre. Or, open each folder and play the files in the folder giving me a means of playlist functionality. The only drawback is that the infotainment always sorts by track name in the metadata. This is good enough for me and I hope it helps someone else that has been building a digital music library since the '90s and refuses to let it go.