Как зарегистрировать свой пункт в меню для моего типа файлов?

uses 
  Registry; 
 
procedure AddFileMenue(FilePrefix, Menue, Command: string); 
var 
  reg: TRegistry; 
  typ: string; 
begin 
  reg := TRegistry.Create; 
  with reg do 
  begin 
    RootKey := HKEY_CLASSES_ROOT; 
    OpenKey('.' + FilePrefix, True); 
    typ := ReadString(''); 
    if typ = '' then 
    begin 
      typ := Fileprefix + 'file'; 
      WriteString('', typ); 
    end; 
    CloseKey; 
    OpenKey(typ + '\shell\' + Menue + '\command', True); 
    WriteString('', command + ' "%1"'); 
    CloseKey; 
    Free; 
  end; 
end; 
 
procedure DeleteFileMenue(Fileprefix, Menue: string); 
var 
  reg: TRegistry; 
  typ: string; 
begin 
  reg := TRegistry.Create; 
  with reg do 
  begin 
    RootKey := HKEY_CLASSES_ROOT; 
    OpenKey('.' + Fileprefix, True); 
    typ := ReadString(''); 
    CloseKey; 
    OpenKey(typ + '\shell', True); 
    DeleteKey(Menue); 
    CloseKey; 
    Free; 
  end; 
end; 
 
{ Example} 
 
procedure TForm1.Button1Click(Sender: TObject); 
begin 
  AddFileMenue('rtf', 'Edit with Notepad', 'C:\Windows\system\notepad.exe'); 
  { 
    If you now click with the right mousebutton on a *.rtf-file then 
    you can see a Menuepoint: "Edit with Notepad". 
    When Click on that point Notepad opens the file. 
  } 
end; 
 
procedure TForm1.Button2Click(Sender: TObject); 
begin 
  { 
   Undo your changes in the Registry: 
  } 
  DeleteFileMenue('rtf', 'Edit with Notepad'); 
end; 

Взято с сайта https://www.swissdelphicenter.ch/en/tipsindex.php