i am using Acrobat Reader 11.0.2

and follow http://stackoverflow.com/questions/16228365/wpf-webbrowser-opens-pdf-file-in-adobe-reader-window

still have error after trying two methods

Navigation to the webpage was canceled

even if using administrator account to open WPF program

private void CheckAndFixWebBrowserRenderingEngine()
        {
            RegistryKey baseRegistryKey = Registry.LocalMachine;
            string renderingEngineSubKeyString = @"SOFTWARE";

            // 64bit operationg systems have another registry path
            if (Environment.Is64BitOperatingSystem)
            {
                renderingEngineSubKeyString += @"\Wow6432Node";
            }

            renderingEngineSubKeyString += @"\Microsoft\Internet Explorer\MAIN\FeatureControl\FEATURE_BROWSER_EMULATION";

            //var assemblyValueKey = System.IO.Path.GetFileName(App.ResourceAssembly.Location);
            var assemblyValueKey = System.IO.Path.GetFileName(System.Windows.Application.ResourceAssembly.Location);
            
            var renderingEngingeValue = 9999; // check other values below

            try
            {
                RegistryKey sk1 = baseRegistryKey.CreateSubKey(renderingEngineSubKeyString);

                var value = sk1.GetValue(assemblyValueKey);
                if (value == null || value.ToString() != renderingEngingeValue.ToString())
                {
                    sk1.SetValue(assemblyValueKey, renderingEngingeValue);

                    //LogHandler.Instance.Add(string.Format("Did update webbrowser rendering engine from {0} to 9000.", value == null ? "[missing]" : value));
                }
            }
            catch (Exception ex)
            {
                //LogHandler.Instance.Add("Could not check webbrowser rendering engine in registry.");
                //LogHandler.Instance.Add(ex.ToString(), Logging.LoggingPriorities.Exception);
            }

            /*
            9999 (0x270F) 
            Internet Explorer 9. Webpages are displayed in IE9 Standards mode, regardless of the !DOCTYPE directive.

            9000 (0x2328) 
            Internet Explorer 9. Webpages containing standards-based !DOCTYPE directives are displayed in IE9 mode.

            8888 (0x22B8) 
            Webpages are displayed in IE8 Standards mode, regardless of the !DOCTYPE directive.

            8000 (0x1F40) 
            Webpages containing standards-based !DOCTYPE directives are displayed in IE8 mode.

            7000 (0x1B58) 
            Webpages containing standards-based !DOCTYPE directives are displayed in IE7 Standards mode.
            */
        }

        public ReportForm()
        {
            this.formID = "Test Report";
            //base.Initialization();
            InitializeComponent();
            CheckAndFixWebBrowserRenderingEngine();

            String PDFPath = @"C:\Users\LAB-User2\Downloads\Elimination_Methods_in_Polynomial_Computer_Alge(Bookos.org).pdf";
            WebBro1.Navigate("file:///" + PDFPath);

Method 2 

i have also tried another method which add reference windowformintegration and use UserControl of winform and it only work in a small WPF project, when i integrate in my

big WPF project, it failed
String PDFPath = @"C:\Users\LAB-User2\Downloads\Elimination_Methods_in_Polynomial_Computer_Alge(Bookos.org).pdf";
            //WebBro1.Navigate("file:///" + PDFPath);
            webBrowser1.Navigate("file:///" + PDFPath);

<WindowsFormsHost Margin="1" x:Name="windowsFormsHost1" Height="600" HorizontalAlignment="Left" VerticalAlignment="Bottom" Width="1000"/>

var uc = new UserControl1();
            this.windowsFormsHost1.Child = uc;

application.UI.CreateNewForm("Test Report", new Client.Reporting.Pages2.ClientStatement.ReportForm());

public partial class ReportForm : BaseForm

public void CreateNewForm(string title, BaseForm form)
	mw.CreateNewForm(title, form);


public class BaseMainWindow : MetroWindow
    {
        public virtual void CreateNewForm(string title, BaseForm form)
        {

        }

Designer