Notes about the PLAYLIST file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.
The PLAYLIST file type is primarily associated with 'Cyberlink DVD Player' by CyberLink Corp.. The file PDVD_MEDIADISC.PLAYLIST seems to be associated with the Cyberlink DVD Player in some manner. This may be the default location for the storage of playlists.