Join File to email

Hi,
I send a post yesterday in order to pop up the user mail if an error occur in my application.
here is the code to compute that :

void SendErrorMail()
{
LPCTSTR pszCmd = _T("mailto:....&subject=.....&body=......");
ShellExecute(NULL,_T("open"),pszCmd,NULL,NULL,SW_SHOW);
}

I would like to join a file to the mail. Is there an easy way to do that ?
 Especially, can We automaticly make a screenshot and join it to the mail ?
Thank you