Sometimes when I import sounds created with Win7's default sound recorder on Windows 7 Ultimate N 64bits I get this error:
<img src="http://i.imgur.com/p2lYK.png" border="0" />
<img src="http://i.imgur.com/v0Dub.png" border="0" />
(I'm still able to use the ogg or the wav in my games though)
I don't know if it has been reported yet, but if you need more info don't hesitate.
Keep up the good work!