The best part about using the Cemu Wii U emulator with Windows XP is that you can use this software while your system is not operating. The second thing you should know about the Cemu Wii U emulator is that it works very well with Windows 7. Windows XP runs slow and is very limited in its abilities. The first thing you need to know about the Cemu Wii U emulator is that it doesn't work well with Windows XP.