Delphi 2007中默认没有ShellTreeView控件，但是有ShellCtrls,dcu单元,所以我们可以使用此单元然后动态创建这个Delphi 7中有的控件：

unit Unit1;

interface

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

type
TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
private
    { Private declarations }
public
    { Public declarations }
end;

var
Form1: TForm1;
s:TShellTreeView;
implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
s:=TShellTreeView.Create(self);
s.ParentWindow:=Form1.Handle;
s.Name:='ShellTree1';
s.Left:=0;
s.Top:=0;
s.Width:=201;
s.Height:=209;
s.Root:='rfDesktop'; //rfMyComputer
end;

procedure TForm1.Button1Click(Sender: TObject);
begin

if DirectoryExists(s.path)then
caption:=s.Path;
end;

end.