Great music playlists take a long time to curate, and when you change computers, you don’t want your playlists getting left behind (or maybe you just want to share your work with a friend). If you’ve got playlists in Windows Media Player, here’s how to transfer them to a different computer.
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Note: Transferring a playlist does not copy the files associated with it, just the link to where those files are stored. To play a playlist on a different computer, you’ll need to have the same music files stored in the same path.
Because a playlist is an XML file that contains the locations of all the songs in it, exporting one to another computer is easy. You can copy them to an external drive or even zip them up and email them. The trick is knowing where to find them.
Open up Windows Media Player and click on “Playlists” to display all your playlists.
Next, right-click on the playlist you want to transfer and then click the “Open File Location” command.
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Source : How to Transfer a Windows Media Player Playlist to a Different Computer