How to substitute WebResource with static file in ASP.NET 3.5

Question

How can I substitute resources which are exposed through the WebResource for particular page?

I have following code in the page markup that perfectly works for the ScriptResource but not for the WebResource:

 <asp:ScriptManager ID="Scriptmanager1" runat="server">
        <Scripts>
            <asp:ScriptReference Name="MicrosoftAjaxWebForms.js" Assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"
                Path="~/MyMicrosoftAjaxWebForms.js" />
            <asp:ScriptReference Name="MicrosoftAjax.js" Assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"
                Path="~/MyMicrosoftAjax.js" />
        </Scripts>
    </asp:ScriptManager>

Actually I need to substitute the WebForms.js script.

---

Related resources: http://www.hanselman.com/blog/ASPNETAjaxScriptCombiningAndMovingScriptResourceaxdsToStaticScripts.aspx