'MS Word VBA x32 ->x64 conversion, replacement for SetParent?

I have an old Word document with VBA built in x32 and I need to updated it to work in x64. I've been going through finding the broken x32 declarations and replacing them, but I've having trouble finding a replacement for the following.

Private Declare Function SetParent Lib "user32.dll" _
(ByVal hWndChild As Long, ByVal hWndNewParent As Long) As Long


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