This can be used in place of IWebBrowser2.ExecWB( Save-As, Dont-Prompt ) which will always prompt the user anyway. The function does not return until the transfer finishes or fails.

    URLDownloadToFile(IE as SHDocVw.IWebBrowser2, urlStr, fileToStoreStr, 0, IntPtr.Zero );

       SHDocVw.IWebBrowser2 axWebBrowser = null;

        axWebBrowser = (SHDocVw.IWebBrowser2)webBrowser.ActiveXInstance;

    public interface IWebBrowser2 : IWebBrowserApp

    Public Interface IWebBrowser2

In C# definition IWebBrowser2 inherits from IWebBrowserApp and it inherits from IWebBrowser. This definition was generated by Interop when referencing SHDocVw. Original one-interface definition of IWebBrowser2 had issues with IE9 in some cases but this new definition works fine.

    public interface IWebBrowser2 : IWebBrowserApp

    Public Interface IWebBrowser2

In C# definition IWebBrowser2 inherits from IWebBrowserApp and it inherits from IWebBrowser. This definition was generated by Interop when referencing SHDocVw. Original one-interface definition of IWebBrowser2 had issues with IE9 in some cases but this new definition works fine.