How to delete folder "~nsu.tmp" un.onGUIend

I'm using MUI2 and have !define MUI_FINISHPAGE_NOREBOOTSUPPORT and I set for un.onGUIEnd with SetOutPath '$TEMP', but my UnInstaller not completed delete folder "~nsu.tmp"

Function un.onGUIEnd
SetOutPath '$TEMP' ;For delete "~nsu.tmp" folder
FunctionEnd

It's still have one file: "Au_.exe"

How can I delete it when the uninstalling complete?.

Au_.exe is an executable which removes your uninstaller and then informs system to remove itself after the next system reboot. "~nsu.tmp" is temporary file of the process and can't removed.