Update! It looks like it won’t be too difficult to implement on Windows either! I did some poking around with RWEverything and the LED controller memory space is right there ready to be poked starting at address 0x0DE8 (IO port space). I manually poked the enable, LED color, and mode registers and could change the LEDs accordingly. This is easily achievable with a PawnIO module that mimics the sysfs entries from the Linux driver and I already have one partially written. I tested that PawnIO was able to enable/disable the LEDs and it could, but more complex interactions will require defining some ioctls and writing an OpenRGB implementation that mirrors the Linux one. Currently setting up my Windows build environment on the Steam Machine.