Various multimedia playlists, including for example Winamp 3 playlists (.b4s) or generic media playlist (.pls), can be most likely converted between between each other so they can be used in media players with limited support of playlist formats.
Convert Winamp 3 playlist file to Media playlist.
We found one software available in the database for this conversion.
Microsoft Windows software - convert b4s to pls on Windows
Advanced playlist creator and manager
Convert from b4s file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.