That wouldn't be half as fun as it was for me to find out these things, though. I even learned something new from it.
It wasn't the problem that bugged me, it was the allure to find out how it is done. Plus, you can't fade in/out music when a battle starts with playback. Some people might even experience no in-game sounds if the playback is locking the audio device. But sure, this is just for the tech-heads. I remember that some games that I played, like car racing games, allowed you to insert an audio cd for playback in the background...
On an unrelented note, if you don't know how to convert your input to raw PCM, the file format detection tells me that it is "RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, stereo 11025 Hz", so converting into this might be as well.