I am using win32 packages to send messages to a window. I manage to get the handle and apparently the message is sent as I get return value 0 from send code. however it has no action in the window, and spyxx does not see the message on the specified handle. my window has no child window and is class UnityWndClass. (I believe it uses a 64 bit process as it was not visible with spy++?)
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Answer
Running the IDE as admin made it work (the program also requires admin)