CMimeMessage::AttachFile类 64bit 发送附件中文为乱码！在线求解

#include "stdafx.h"
#include "CSMTPConnectionl.h"int _tmain(int argc, _TCHAR* argv[])
{
CoInitialize( NULL );
 CMimeMessage _Sendmail;
   //Lenovo Simple e-mail server 
   _Sendmail.SetSender(L"[email protected]");
   _Sendmail.SetSenderName(L"MagicClient",936);
   _Sendmail.AddRecipient(L"[email protected]",NULL,936);
   _Sendmail.SetSubject(L"测试邮件lenovo",936);
   _Sendmail.AddText(L"测试邮件lenovo",-1,1,936);
//bRet = AtlMimeConvertString(pMultiLanguage, uiCodePage, szText, &szTextPtr, &nLen);
   _Sendmail.AttachFile(L"D:\\yingzi呵呵33.txt",NULL,NULL,0,936);
   CSconnection conn;
  if(conn.Connect(L"qq.com"))
  {
  if(conn.SendMessageW(_Sendmail)==TRUE)
  conn.Disconnect();
  }
return 0;
}
发送中文附件 会有问题，标题和正文都正常