Cerrar una aplicación externa sabiendo el nombre de su ejecutable

function KillTask(FileName:String):integer;
var 
  ContinueLoop: BOOL;
  FSnapshotHandle: THandle;
  FProcessEntry32: TProcessEntry32;
const 
  PROCESS_TERMINATE=$0001;
begin 
  FSnapshotHandle := CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS,0);
  FProcessEntry32.dwSize := Sizeof(FProcessEntry32);
  ContinueLoop := Process32First(FSnapshotHandle,FProcessEntry32);
  while integer(ContinueLoop)<>0 do 
  begin 
    if ((UpperCase(ExtractFileName(FProcessEntry32.szExeFile)) = UpperCase(FileName))
        or (UpperCase(FProcessEntry32.szExeFile) = UpperCase(FileName))) then 
      Result := Integer(TerminateProcess(OpenProcess(PROCESS_TERMINATE,BOOL(0),
                          FProcessEntry32.th32ProcessID),0));
    ContinueLoop := Process32Next(FSnapshotHandle, FProcessEntry32);
  end; 
  CloseHandle(FSnapshotHandle);
end;

procedure TForm1.Button1Click(Sender: TObject);
begin 
  KillTask('Notepad.exe');
end;