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 private
    FFileName: string;
    procedure SetFileName(const FileName: String);
    procedure PerformFileOpen(const AFileName: string);

...


procedure TMainForm.SetFileName(const FileName: String);
begin
  FFileName := FileName;
  Caption := Format('%s - %s', [ExtractFileName(FileName), Application.Title]);
end;

procedure TMainForm.FormCreate(Sender: TObject);
begin
  Application.title:='BildDatenbank';
  OpenDialog1.InitialDir := ExtractFilePath(ParamStr(0));
  SaveDialog1.InitialDir := OpenDialog1.InitialDir;
  Anwendung    := '"' + paramstr(0) + '" "%1"';

  try
    CreateRegKey(Extension,'',Schluessel);
    CreateRegKey(Schluessel,'',Beschreibung);
    CreateRegKey(Schluessel + '\shell\open\command','',Anwendung);
  except
    on EOleRegistrationError do
      ShowMessage('Mist! Hat nicht geklappt');
  end;


end;



procedure TMainForm.PerformFileOpen(const AFileName: string);
begin
  Editor.Lines.LoadFromFile(AFileName);
  Opendialog1.filename:=AfileName;
  Application.title:=AFilename;
  listbox1.Items.LoadFromFile(afilename);
  image1.Picture.loadfromfile (listbox1.Items[0]);
  SetFileName(AFileName);
  Editor.Modified := False;

end;

procedure TMainForm.FileOpen(Sender: TObject);
begin
  if OpenDialog1.Execute then
  begin
    PerformFileOpen(OpenDialog1.FileName);
    Editor.ReadOnly := ofReadOnly in OpenDialog1.Options;
  end;
end;


procedure TMainForm.FormShow(Sender: TObject);
begin

  { Check if we should load a file from the command line }
  if (ParamCount > 0) and FileExists(ParamStr(1)) then
    PerformFileOpen(ParamStr(1));
end;					

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procedure TForm1.FormCreate(Sender: TObject)
begin
  ShowMessage(ParamStr(1));
end;					

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program Project1;
var
  Idx: Integer;
begin
  For Idx := 1 To ParamCount Do
    WriteLN (ParamStr (Idx));

  ReadLN;
end.