webKitBrowser *.doc link click

using System.Windows.Forms;

//...

public class MyForm : Form {

    const string viewer = "https://docs.google.com/viewer";
    const string viewerUrl = viewer + "?url={0}";
    const string docSample = "https://docs.google.com/viewer?url=http://www.gotw.ca/publications/C%2B%2BCLIRationale.pdf";

    WebBrowser browser = new WebBrowser(); // you probably do it in designer, but I want to show all in 1 file

    static bool IsDocumentToRedirect(string url) {
        return url.ToLower().EndsWith(".pdf");
        // you can also use .doc and .docx, I did PDF for my testing
    } //IsDocumentToRedirect

    public MyForm() {
        browser.Dock = DockStyle.Fill; // would be done in designer
        browser.Parent = this; // would be done in designer
        // commented out, to show that the designer is not used, 3 lines of code replace it:
        // InitializeComponent()
        browser.Navigating += (sender, eventArgs) => {
            string urlString = eventArgs.ToString();
            if (IsDocumentToRedirect(urlString) && !urlString.ToLower().StartsWith(viewer)) {
                eventArgs.Cancel = true;
                browser.Navigate(string.Format("{0},{1}", eventArgs.Url));
            } //if
        }; //browser.Navigating
    } //MyForm

    protected override void OnShown(EventArgs e) {
        // this is done just to simulate the click on anchor and test
        // redirection:
        this.browser.Navigate(docSample);
    } //OnShown

} //class MyForm