Hi,
In the official document of Windows iot core - Hardware Compatibility List, there is no WiFi Adapters compatible with ARM64 architecture. But as stated in the document this list is not exhaustive. There are many other peripherals not listed on this page that are compatible with Windows 10 IoT Core.
For Raspberry Pi 3 Model B (ARM64) with built-in Wi-Fi, the windows iot core can work normally.