A recurring topic is Windows drivers for the Raspberry Pi 3 and 4 series.
MCCI DesignWare USB2 driver
This is for the front USB ports on Pi 3 and only the Type-C port on the Pi 4.
MCCI Corporation has made their TrueTask USB host stack available to the Raspberry Pi WoA community for non-commercial, evaluation purposes. MCCI did the original work for the 32-bit Windows IoT Core. It is available courtesy of Terrill Moore, CEO of MCCI, who graciously spent time in early 2019 to get it building and validated with the 64-bit Pi 3 UEFI.
If you like the drivers, I hope you’ll support The Things Network New York. MCCI does some pretty amazing things with LoRaWAN.
Note that the driver will not correctly work on Pi 4 boards with more than 1GB of RAM, unless you limit the RAM seen by Windows. See this guide.
OSS DesignWare USB2 driver
Before the MCCI driver was released, this was the only option. Originally based on an earlier version the UEFI USB driver and the UCX framework, it’s not particularly stable or recommended. It was originally developed by @NTAuthority, who was the first person ever to show Windows running on Pi 3 (rumor goes, with an early variant of the Pi 3 UEFI ;-)). And he thankfully left enough crumbs for the rest of us to pick up and carry the torch.
Other BSP drivers
These were originally put up by Microsoft as part of the 32-bit Windows IoT Core BSP for the Pi 2/3. After a bit of cleaning, they build and run fine on 64-bit Windows.