I have that message too with this version:

c:\Tools\QEMU>qemu-system-aarch64.exe -version
QEMU emulator version 2.11.90 (v2.12.0-rc0-11704-g30195e9d53-dirty)

My launch params are:
C:\TOOLS\QEMU\qemu-system-aarch64.exe -M raspi3 -kernel 

My system is Windows 7 64bit
The qemu package downloaded is the 64bit version.

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  Unexpected error

Status in QEMU:

Bug description:
  When run it this error happens:
  Unexpected error in aio_context_set_poll_params() at 
  C:\Program Files\qemu\qemu-system-x86_64.exe: AioContext polling is not 
implemented on Windows

  This application has requested the Runtime to terminate it in an unusual way.
  Please contact the application's support team for more information.

  Windows 10 x64

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