Windows Media Player 11 Forum

I found this useful thread:
http://askubuntu.com/questions/5296/how-to-install-windows-media-player-11-on-wine

(2nd answer down, when I looked at it.)

Here are the important parts:

1. Download the WMP11 XP installer from here: http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=8163 (You will need to pass WGA to get it.)
2. Create a new bottle.
3. Set the windows version of the bottle to "Windows 2003"
4. Launch the installer. It should ask to Validate. Click the "Validate" button and STOP! DO NOT ACCEPT THE EULA YET!
5. Set the windows version of the bottle to "Windows XP".
6. Accept the EULA. The WMP11 installer should now proceed. Supposedly it may hang and you just have to re-do this process, but it went all the way through the first time for me.
7. Supposedly it will also always say the install failed at the end of the installation, although it has not actually failed.
8. Run "wmplayer.exe". I tried using "Custom Settings", but this killed it. Using "Recommended Settings" seemed to work.
9. Supposedly set your windows version to "Windows 7" and WMP11 should work OK-ish now. I never made it to this point - it crashes immediately on launch now.