Save EbmeddedFile on the drive using PDFViewer

Hi

I used PDFViewer on my C# project in VS2008. I would like to build the attachment panel.  On the below code I can get the correct number of attachment file on pdf.  I  used axDPVActiveX1.DQPLGetEmbeddedFileContentToFile  method for saving the attachment on other location. The file I saved cannot open on Adobe Reader. It indicated that the file is either not a support type or because the file has been damaged.   Would someone tell me what is wrong with my code. Thanks in advance.

 for (int i = 1; i <= axDPVActiveX1.DQPLEmbeddedFileCount(); i++)
            {

                axDPVActiveX1.DQPLSelectPage(i);

                string str = "Index: " + i.ToString() + Environment.NewLine;
                str+= "File nmae: " + axDPVActiveX1.DQPLGetEmbeddedFileStrProperty(i, 1) + Environment.NewLine;
                str += "MIME type: " + axDPVActiveX1.DQPLGetEmbeddedFileStrProperty(i, 2) + Environment.NewLine;
                str += "Creation date: " + axDPVActiveX1.DQPLGetEmbeddedFileStrProperty(i, 3) + Environment.NewLine;
                str += "Modification date: " + axDPVActiveX1.DQPLGetEmbeddedFileStrProperty(i, 4) + Environment.NewLine;
                str += "Title: " + axDPVActiveX1.DQPLGetEmbeddedFileStrProperty(i, 5) + Environment.NewLine;
                str += "Description: " + axDPVActiveX1.DQPLGetEmbeddedFileStrProperty(i, 7) + Environment.NewLine;
                str += "ID: " + axDPVActiveX1.DQPLGetEmbeddedFileID(i) + Environment.NewLine;             

                MessageBox.Show(str);
                if (axDPVActiveX1.DQPLGetEmbeddedFileStrProperty(i, 5).Contains(".pdf"))
                {
                    axDPVActiveX1.DQPLGetEmbeddedFileContentToFile(i, @"C:\Users\UserName\Desktop\Testing folder\test_" + i.ToString() + ".pdf");
                }

               

            }

Hi,