Guide: Adding MP3s
You will need XCC Mixer, XCC IMA ADPCM WAV Writer Plug-In, Command & Conquer: Red Alert 2 and WinAmp.
You can download the XCC utilities from http://xcc.tiberian.com/.
You can download WinAmp from http://www.winamp.com/.
Install and enable the XCC IMA ADPCM WAV Writer Plug-In.
Convert the songs you would like to add to RA2 by simply playing them with WinAmp. You won't get a prompt to save the file, this happens automatically.
Start XCC Mixer.
Launch XCC Theme Writer.
If everything worked ok, you'll see a message box like this one.