Where do I get codecs and/or a fix for this.....

I can play the .wav files outside of the game if I go to the directory and click... they play in media player...
I get no sound in the game....

Version 1.00 (Jul 4 2011)
WINDOWS VERSION: 6.1.7601. Platform ID: 2. CSDVersion: Service Pack 1
mciSendString(open "C:\Program Files (x86)\Slitherine\Panzer Corps\.\Audio\Music/menu.mp3" type mpegvideo alias Music/menu) failed.
Error: 'A problem occurred in initializing MCI.' (code: 277)

I start the game and no Video or Sound...
Windows 7 64 Bit System....

I just get black screen.... then I click and I am at main menu... no sound.