I have a rMBP 15" late 2013, and I am running bootcamp with Windows 8.1. All the bootcamp drivers installed correctly. Everything works great, except that the SD card reader is not detected at all by the computer, and it doesn't work. However, in OSX, it works fine. Any ideas on a fix, or anyone else with this issue? The SD card reader works fine in bootcamp on my 2010 MBP, so I know it's possible to use it in windows.