content type of DataResource

I am using a ClientBundle with DataResource elements for audio files
used as sound effects. e.g.

public interface Sounds extends ClientBundle {
@Source("sound1.mp3") DataResource sound1();
@Source("sound2.wav") DataResource sound2();
}

In the above example, the url of sound1begins "data:content/
unknown;...." while sound2 begins "data:audio/x-wav"

How do I influence what content type appears in the data url? For
instance, I would like audio/mp3 as opposed to "content/unknown"

thanks

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