Maybe you should start with Win1.0, it isn't a stack-like OS(notice how you can stack Windows on top of Windows), instead it works with the applications being tiles. Windows 10 is also too powerful for the o3DS/n3DS(my PC has 4gb, and it doesn't even keep up with memory most of the time). If you don't know Win1.0 looks or works, it's on WinWorldPc(VMs) and you can try it online: PCJS.org