MFC英文系统下保存csv中文乱码问题

//创建mht文件，并写入数据
 mhtFile.Open(filePath, CFile::modeCreate|CFile::modeWrite); 	//mhtFile为CFile类型，filePath为文件路径CString类型
 //-------以下是将Unicode字符转为utf-8字符，这样才能正常显示中文
 DWORD dwFileLen = mhtFile.GetLength();
 if (0 == dwFileLen)
 {
  const unsigned char LeadBytes[] = {0xEF, 0xBB, 0xBF};
  mhtFile.Write(LeadBytes,sizeof(LeadBytes));
 }
 int nSrcLen = (int)wcslen(content);//content为要写入的文本
 CStringA utf8String(content);
 int nBufLen = (nSrcLen+1) * 6;
 LPSTR buffer = utf8String.GetBufferSetLength(nBufLen);
 int nLen = AtlUnicodeToUTF8(content, nSrcLen, buffer, nBufLen);
//上面的函数AtlUnicodeToUTF8()需头文件：<atlenc.h>
//功能：将unicode转换成utf-8
 buffer[nLen] = 0;
 utf8String.ReleaseBuffer();
 mhtFile.SeekToEnd();
 //将转码后的内容写入mht文件
 mhtFile.Write(utf8String.GetBuffer(),nLen);
 mhtFile.Write("/r/n",2);
 mhtFile.Close();