Goldwave can do this quite easily. First open the file in Goldwave. Play the file to see where the first track is. Now right click at the start of your chosen track. Then left click 'set start marker'. Do the same right click to 'set finish marker'. You should now have your selected track highlighted and the rest dark. If you click the yellow play button it will play just this piece. If its not quite right you can drag the mark to move it. Now click File, Save As, and give your first track a name, you should also have options for mp3 quality. Now just do the same again to grab your second track. Just remember that the blue part will be saved, the dark part won't.