Файл в CP1251 -> HTML

    StreamReader sr = new StreamReader(@AdressIN, Encoding.GetEncoding(1251));
    StreamWriter sw = File.CreateText(@AdressOUT);
    string start =
@"<!DOCTYPE html>
<html>
<head>
<meta charset = ""utf-8"">
<title>New Page</title>
</head>
<body>
<p>";
    string end =
@"</p>
</body>
</html>";
    sw.WriteLine(start);