Both .zpl and .wpl are multimedia playlists and as such zpl to wpl conversion typically covers the situation in which users need or want to convert their old playlists to another format. Your best option in this case is to take advantage on one of the dedicated playlist managers.
But nowadays many multimedia players (such as VLC) support many playlist files and can be used to resave them to different formats.
Updated: October 31, 2023