Problem for 404 Error handing in asp.net

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ASP.NET

Dear Friends,
Im using Asp.net 2008, for that i need to use Error handling for .html pages. I tried it using Web config file like as below

<customErrors defaultRedirect="Default.aspx" mode="On" >
      <error statusCode="404" redirect="/Default.aspx" />
    </customErrors>

But it works only for .aspx extension pages it absolutely get fails for .html pages.
Do please tell me its solution.

Regards,

Yogesh