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var t = Timer.new()
t.set_wait_time(3)
t.set_one_shot(true)
self.add_child(t)
t.start()
yield(t, "timeout")
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I have Windows 10, version 1709. One of the other answers got me looking in the registry and I found exactly what I needed in clear text at
HKEY_CURRENT_USER\Control Panel\Desktop\WallPaper
No decoding needed.