On Windows, just the .wpl file — it should open automatically in Windows Media Player.

It is an XML file using the Synchronized Multimedia Integration Language (SMIL) structure. Because it is text-based, you can open and edit it using any simple text editor like Notepad.

A WPL file can be opened using Windows Media Player or other media players that support the WPL format. To open a WPL file using Windows Media Player, follow these steps: