RadCaptcha control uses the <audio/> tag (HTML5) to play the audio code, or the <embed/> tag if the browser does not support <audio/>. Newer versions of Safari support <audio/>, and more specifically support audio files of type .wav
. So, I believe there shouldn't be a problem to play the audio under Mac OS, since this is not a platform dependent issue, but a browser one.
RadCaptcha supports only .wav audio format, and cannot be configured to use mp3 instead.
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