I use Windows 2016 / Windows 10 VMs on a MacBook Pro (with ESC key :-) with Retina Display. All Windows version run fine with HiDPI resolution. Only thing is that Fiddler4 shows its texts in a lower resolution, so all texts have the right size, but they are are shown with less dpi, so you can see the pixels. Would be great to set the right flags for the windows resources to enable HiDPI support showing better texts without pixels.