It's too similar to other Microsoft software which is not ready for primetime.
Don't know if this is the right forum or not but here goes. On Saturday I paid for and downloaded a couple of songs from MSN Music. They Played alright then but ever since have refused to play. They say a codex is missing. The codex is 161 and is available in a download of codex 9. Have downloaded several times but get same error message.
Richard

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic