Sorry about the multiple posts, but I have discovered additional information.\n\nWindows Media Player version: 10.00.00.3646\n\nOperating system: Windows XP Home Edition Version 2002 SP2\n\nError message ID number: C00D11CD\n\nWindows Media Player encountered an unknown error. This can occur when\nanother program or operating system component encounters a problem but does\nnot communicate the nature of the problem to the Player.\n\nHere is what I just discovered. The error only occurrs when attempting to\nplay a WPL file in a playlist from INSIDE Windows Media Player. However, the\nfiles play fine when selecting one of the the WPL files from OUTSIDE of\nWindows Media Player. So, how do I configure WMP 10 to play the WPL files?\n\nAny help would be appreciated. Thanks.