Windows Media Player

I have searched and searched but cannot find anything regarding WMP and when the search did respond it said I did not have access.

Anyway the question

Windows Media Player was working fine, and even though I havn't installed anything it now wont play the selected file or files anyone any ideas what commands to use? I just had the Allfiles command?

When you say WMP won't play the selected files do you mean when you double-click them or something else?

Does WMP play if you double-click files on the Desktop or in Explorer?

i.e. Is it something that Opus is doing strange, or is WMP no longer properly associated with the files?