renaming an exe while executing

i asked this question a couple days ago

https://www.experts-exchange.com/Programming/Programming_Languages/MFC/Q_20720592.html

i wanted to execute an external exe and wait for its completion before my program continues

i used this code:

DWORD ExecuteAndWaitForCompletion   (   LPSTR   pszCmd)
{
  STARTUPINFO         si;
  PROCESS_INFORMATION pi;

  BOOL                bRes;

  DWORD               dwCode  =   0;

  MSG                 msg;

  ZeroMemory  (   &si,    sizeof  (   STARTUPINFO));

  si.cb           =   sizeof  (   STARTUPINFO);
  si.dwFlags      =   STARTF_USESHOWWINDOW;
  si.wShowWindow  =   SW_SHOWNORMAL;

  bRes    =   CreateProcess   (   NULL,
                                  pszCmd,
                                  NULL,
                                  NULL,
                                  TRUE,
                                  NORMAL_PRIORITY_CLASS,
                                  NULL,
                                  NULL,
                                  &si,
                                  &pi
                              );

  while   (   WAIT_OBJECT_0   !=  MsgWaitForMultipleObjects   (   1,
                                                                  &pi.hProcess,
                                                                  FALSE,
                                                                  INFINITE,
                                                                  QS_ALLINPUT
                                                              )
          )
          {
              while   (   PeekMessage (   &msg,   NULL,   0,  0,  PM_REMOVE))
                      {
                          DispatchMessage     (   &msg);
                      }
          }

  GetExitCodeProcess  (   pi.hProcess,    &dwCode);

  CloseHandle (   pi.hProcess);
  CloseHandle (   pi.hThread);

  return  (   dwCode);
}

it works just fine.  however, in another version of this same program (where I used .NET - which is why I'm redoing in MFC) i was able to launch the external EXE and then rename the EXE file to .tmp so the user would have a hard time finding it

i don't want the user to find this exe because it is an unencrypted thing that I don't want them to detach from my wrapper application

how can i modify the above code to rename the EXE to FILENAME.tmp after the EXE begins executing?

thanks,

Justin Kohlhepp
New Standard