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 D:\QEMU-img\2017-12-04-pcudev01l.img
My system is Windows 7 64bit The qemu package downloaded is the 64bit version.
I have that message too with this version:
c:\Tools\ QEMU>qemu- system- aarch64. exe -version 0-rc0-11704- g30195e9d53- dirty)
QEMU emulator version 2.11.90 (v2.12.
My launch params are: QEMU\qemu- system- aarch64. exe -M raspi3 -kernel D:\QEMU- img\2017- 12-04-pcudev01l .img
C:\TOOLS\
My system is Windows 7 64bit
The qemu package downloaded is the 64bit version.