There is no built-in functionality that will enable the user (developer) to choose a name for the audio file generated by the RadCaptcha control. The only way to do this is the end-user to modify its name, before saving it locally.
In the next official the audio code will be embedded on the page, and the user will not need to download the file first. The audio will be played directly on the page. The new version of the RadControls for ASP.NET AJAX will be out this week.
All the best,
the Telerik team
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