PLF is an acronym for Playlist File. Files that contain the .plf file extension most commonly store playlist files for the InterVideo WinDVD software application, which is now owned by Corel. When a user creates a playlist within the application, the PLF file is created, containing an index of the media files referenced in the playlist.
The BlazeDVD Microsoft DVD player also uses the .plf extension for the creation of playlist files that are used with the software.
The .plf file format is also used by the Papyrus Live Updater application. Papyrus uses the software for license files which contain the license information for various applications, plug-ins and modules.
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If you have additional information about the PLF file format or software that uses files with the PLF suffix, please do get in touch - we would love hearing from you.