Which is why I was referring to Windows RT rather than Windows 10 IoT. I think Windows IoT is meant to run on really tiny under-powered devices. The specs of the RaspberryPi 3 seem to look more like a modern smartphone and I would assume Windows RT would run OK on it.
FWIW, I think the Windows IOT that's made for RPi will be a big disappointment for most people - as the expectation would be "regular Windows, compatible with Anything and Everything, just running on RPi" versus the reality of "something that loosely resembles Windows, but severely limited". In this, I believe that it's better to dive into a Linux distro (the NOOBS one should make stuff easier) - there's a learning curve, but you're not getting sidetracked by the expectation of "runs on desktop Windows, why is it refusing to run here?"