Encoding

public Encoding Encoding { get; set; }

LoadOptions loadOptions = new LoadOptions();
loadOptions.Encoding = Encoding.ASCII; // ضبط الترميز

using (Viewer viewer = new Viewer("message.txt", loadOptions))
{
    HtmlViewOptions viewOptions = 
        HtmlViewOptions.ForEmbeddedResources();

    viewer.View(viewOptions);
}