Загрузка и обработка большого файла в StringList

var
  t:TextFile ;
  s:TStringlist ;
  x:String ;
begin
if sOpenDialog1.Execute then
  begin
  s:=TStringlist.Create;
  AssignFile(t,sOpenDialog1.FileName);
  Reset(t);
  while not eof(t) do
  begin
    Readln(t,x);
    s.Add(x) ;
  end;
  CloseFile(t);
  showmessage(inttostr(s.Count)) ;
  FreeAndNil(s) ;
  end;

var
s:tstringlist;
 
procedure load;
begin
s:=tstringlist.create;
s.loadfromfile(opendialog.filename);/// 700мб out of memory
show;
end;
 
procedure show;
begin
showmessage(s[0]);
end;

unit Unit1;
 
interface
 
uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls;
 
type
  TForm1 = class(TForm)
    btn1: TButton;
    dlgOpen1: TOpenDialog;
    procedure btn1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
 
var
  Form1: TForm1;
  s:TStringList;
 
implementation
 
{$R *.dfm}
 
procedure TForm1.btn1Click(Sender: TObject);
begin
dlgOpen1.FileName:='';
if dlgOpen1.Execute then
begin
s:=TStringList.Create;
s.LoadFromFile(dlgOpen1.FileName);
ShowMessage(IntToStr(s.Count));
s.free;
end;
end;
 
end.