Windows keeps automatically adding EN-US keyboard layout

For some reason, Windows seems to regularly check to see if I’m using the EN-US keyboard layout, and adds it if I’m not. This ends up adding another entry to my already long list of layouts to cycle through. Windows seems quite fine with me not using the default Japanese layout (I use Google’s, not Microsoft’s) – the Microsoft one reappeared after the Anniversary Update, but hasn’t come back after having been sent away.

Source: answers.microsoft.com