[jonydread]

he tratado de hacerlo asi

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Edit1: TEdit;
    Label1: TLabel;
    Button1: TButton;
    OpenDialog1: TOpenDialog;
    procedure open(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.open(Sender: TObject);
begin
OpenDialog1.Filename := '".reg"';
end;

end.

en el codigo qe dejaste debo cambiar algo
"edtMovimientos.Text" por ej qe se coloca aqui
tambien me sale error en esta linea if OpenDialog1.Execute then

gracias por su ayuda!