You can load one page as
FileStream source = new FileStream(filepath, FileMode.Open, FileAccess.Read);
webBrowser1.DocumentStream = source;
or even how
string html = File.ReadAllText(filepath);
webBrowser1.DocumentText = html;
But if you have images, css or js in relative paths, use
Uri uri = new Uri(filepath);
webBrowser1.Navigate(uri);
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