uses
ShellAPI;

procedure TForm1.Button1Click(Sender: TObject);
var m_path : string;
begin
  m_path := 'http://www.naver.com';
  ShellExecute(0, 'open', m_path, nil, nil, SW_SHOWNORMAL);
end;

위처럼 했드만 에러가 나네요...
도움말을 보니
HINSTANCE ShellExecute(

    HWND hwnd,    // handle to parent window
    LPCTSTR lpOperation,    // pointer to string that specifies operation to perform
    LPCTSTR lpFile,    // pointer to filename or folder name string
    LPCTSTR lpParameters,    // pointer to string that specifies executable-file parameters
    LPCTSTR lpDirectory,    // pointer to string that specifies default directory
    INT nShowCmd     // whether file is shown when opened
   );   
처럼 되어있던데 IpFile 이라 하믄 어떤 형식으로 변수를 선언해야 위에것이 먹힐까요??