...determine the version of Internet Explorer?

uses
  Registry;

function GetIEVersion(Key: string): string;
var
  Reg: TRegistry;
begin
  Reg := TRegistry.Create;
  try
    Reg.RootKey := HKEY_LOCAL_MACHINE;
    Reg.OpenKey('Software\Microsoft\Internet Explorer', False);
    try
      Result := Reg.ReadString(Key);
    except
      Result := '';
    end;
    Reg.CloseKey;
  finally
    Reg.Free;
  end;
end;


procedure TForm1.Button1Click(Sender: TObject);
begin
  ShowMessage('IE-Version: ' + GetIEVersion('Version')[1] + '.' + GetIEVersion('Version')[3]);
  ShowMessage('IE-Version: ' + GetIEVersion('Version'));
  // <major version>.<minor version>.<build number>.<sub-build number>
end;

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