これで最後の行まで動いたよ

Dim hWndTray As LongPtr: hWndTray = FindWindow("Shell_TrayWnd", vbNullString)
Dim hWndRebar As LongPtr: hWndRebar = FindWindowEx(hWndTray, 0, "ReBarWindow32", vbNullString)
Dim hWndMSTaskSwWClass As LongPtr: hWndMSTaskSwWClass = FindWindowEx(hWndRebar, 0, "MSTaskSwWClass", vbNullString)
Dim hWndMSTaskListWClass As LongPtr: hWndMSTaskListWClass = FindWindowEx(hWndMSTaskSwWClass, 0, "MSTaskListWClass", vbNullString)

Dim pUIAutomation As New CUIAutomation
Dim windowElementTray As IUIAutomationElement
Set windowElementTray = pUIAutomation.ElementFromHandle(ByVal hWndMSTaskListWClass)
MsgBox "終わり"