[NumLock]

можно причесать для красоты:

Код:

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  ExePath: String;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
  Caption:=ExePath;
end;

initialization
  ExePath:=IncludeTrailingPathDelimiter(ExtractFilePath(ParamStr(0)));

end.