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uses TLHelp32;

...

procedure WindowTitleToEXE(fenstertitel: string; var ergebnis: TStringList);
var PID: DWord;
  aSnapShotHandle: THandle;
  ContinueLoop: Boolean;
  aProcessEntry32: TProcessEntry32;
begin
  ergebnis.clear;
  GetWindowThreadProcessID(FindWindow(nil, PChar(fenstertitel)), @PID);
  aSnapShotHandle := CreateToolHelp32SnapShot(TH32CS_SNAPPROCESS, 0);
  try
    aProcessEntry32.dwSize := SizeOf(aProcessEntry32);
    ContinueLoop := Process32First(aSnapShotHandle, aProcessEntry32);
    while Integer(ContinueLoop) <> 0 do begin
      if aProcessEntry32.th32ProcessID = PID then
        ergebnis.Add(aProcessEntry32.szExeFile);
      ContinueLoop := Process32Next(aSnapShotHandle, aProcessEntry32);
    end;
  finally
    CloseHandle(aSnapShotHandle);
  end;                    

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procedure TForm1.Button1Click(Sender: TObject);
var slist: TStringList;
begin
  slist:=TStringList.Create;
  try
    WindowTitleToEXE('Notepad', slist);
    ListBox1.Items.AddStrings(slist);
  finally
    slist.free;
  end;
end;