[Aptic7]

Извините
Так правильно?

Код:

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

Код:

 procedure TForm1.Button1Click(Sender: TObject);
begin
 with CreateInArchive(CLSID_CFormat7z) do
 begin
   OpenFile('c:\test.7z');
   ExtractTo('c:\test');
 end;
end;