Create an empty HTML page:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=windows-1250">
<meta name="generator" content="PSPad editor, www.pspad.com">
<title>MY Downloads
</title>
</head>
<body>
</body>
</html>
Save it somewhere you can find it:
D:\Temp\blank.html
will do.
Then just
Process.Start("D:\Temp\blank.html")
That'll start the default browser for the system, and open the blank file.