title: Python, pygame: Unable to open .wav file
body: <p>I am trying to play a simple beat with the <code>pygame.mixer</code>.</p>
  
  <pre><code>import os
  import pygame
  import pygame.mixer
  
  # Initialize the game
  pygame.init()
  pygame.mixer.init() # frequency, size, channels, buffersize
  print(os.listdir())
  
  # ... some other stuff....
  
  try:
      sound = pygame.mixer.Sound("low_click.wav")
      print('low_click.wav')
      sound.play()
  except pygame.error:
      pass
  </code></pre>
  
  <p>The program just prints</p>
  
  <pre><code>['metronom_quintenzirkel.py', 'low_click.wav', 'data']
  </code></pre>
  
  <p>, so an exception occured.</p>
  
  <p>What has gone wrong?</p>