unit Unit1;    interface    uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls;    type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;    var
  Form1: TForm1;    implementation
uses registry;
{$R *.DFM}    procedure RegisterExtension(
  const sAppName: String;
  const sAppPath: String;
  const sIconName: String;
  const sExtension: String);
var
  Reg: TRegistry;
begin { RegisterExtension }
  Reg := TRegistry.Create;
  with Reg do
  begin
    RootKey := HKEY_CLASSES_ROOT;
    OpenKey(sExtension, True);
    WriteString('', sAppName);
    CloseKey;
    OpenKey(sAppName, True);
    WriteString('', sAppName);
    OpenKey('DefaultIcon', True);
    WriteString('', sIconName);
    CloseKey;
    OpenKey(sAppName '\shell\open\command', True);
    WriteString('', sAppPath);
    CloseKey;
    Free;
  end { with Reg };
end; { RegisterExtension }    procedure TForm1.Button1Click(Sender: TObject);
begin    begin
  RegisterExtension('記事本',
                    'c:\winnt\system32\notepad.exe',
                    'c:\test.ico',
                    '.txt');
end    end;    end.