[jonydread]

comienzo a comprender
gracias ay esta como debia hacerlo ahora voy por lo demas

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, XPMan;

type
  TForm1 = class(TForm)
    XPManifest1: TXPManifest;
    Edit1: TEdit;
    Button1: TButton;
    OpenDialog1: TOpenDialog;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
begin
opendialog1.Execute;
opendialog1.Filter := 'Archivos de registro|*.reg';
edit1.Text := OpenDialog1.FileName;
end;

end.

gracias nuevamente!!