How to Change the Music in Computer Games

1. 1
   Open Control Panel and choose “Folder Options”.
   • Click on the “View” tab and check “Show hidden files and folders”.
     
   • Click OK. Close Control Panel.
     
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2. 
   2
   Go to the place where you saved the program at installation. (default is C:\Program Files). Open up the folder of your game. Look for a .wav file (example: Start.wav). Open it with Sound Recorder.
3. 
   3
   Play it first to make sure that it is the right one. Then, click File > Save As... and save as, for example, start2.wav. Then delete the whole sound and record something.
4. 
   4
   Rename the old sound to "startOld.wav" then rename the new one to "start.wav" or whatever the original was called. Do not move the files.
5. 
   5
   Run the game. You should hear your new sound whenever you were hearing the old one. 

Source : http://www.wikihow.com/Change-the-Music-in-Computer-Games