Email SMTP attachment shows untitled1

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VC6

C++

I have used:

CSMTPMessage* pMessage = CreateMessage("test_host@hotmail", "test_client@hotmail" ,"c:\\Docs\\Letter.txt");

The Email & attachment sending sucessfully, however the attachment show in the client was always untitle1 ... not Letter.txt!

Anyone can help how to define the attachment title? :doh:

Just in case, I attach the function CreateMessage:

CSMTPMessage* CConfirmation::CreateMessage(CSMTPAddress FromAddr, CString ToAddr, CString Attachment)
{
    CSMTPMessage* pMessage          = new CSMTPMessage;

    pMessage->AddMultipleRecipients(ToAddr , CSMTPMessage::TO);
    pMessage->m_sSubject = "Email Confirmation";

    //Attach file here
    pMessage->AddMultipleAttachments(Attachment);

    pMessage->m_From = FromAddr;
    pMessage->m_ReplyTo = FromAddr;

    //New code
    pMessage->AddTextBody(EmailBody);

    #ifdef _DEBUG
      pMessage->AddCustomHeader(_T("X-Program:    CSTMPMessageTester"));
    #endif

    return pMessage;
}