A WPL file is a playlist file used by Windows Media Player. It contains a list of audio and video files that are intended to be played in a specific order. The WPL file itself doesn't contain the actual media data; instead, it stores the paths or URLs to the media files. This allows users to create and save custom playlists for easy access and playback of their favorite music or videos. WPL files are typically small in size because they only contain references to the media files, not the files themselves. They are a convenient way to organize and manage media collections within Windows Media Player. The format is XML-based, making it relatively easy to parse and edit, although it's generally recommended to use Windows Media Player for creating and managing WPL playlists.