VB.NET การอ่านไบท์ด้วยคำสั่ง ReadAllBytes แต่โปรแกรมไม่รู้จัก

 Dim request As FtpWebRequest = DirectCast(WebRequest.Create("ftp://amecdomain\\iswin:IS2013Dept@amecpoint/QA_Dept/e-Document/FILE_PhotoRecsys/golf.txt "), FtpWebRequest)
            request.Credentials = New NetworkCredential("username", "password")
            request.Method = WebRequestMethods.Ftp.UploadFile

            Dim File() As Byte = System.IO.File.ReadAllBytes("Nand\\pic")

            Dim strz As System.IO.Stream = request.GetRequestStream()
            strz.Write(File, 0, File.Length)
            strz.Close()
            strz.Dispose()