I once did the same with Microsoft Windows 8 (or 8.1) keyboard layout changes breaking old software. You'd think they don't suddenly change from '.' to ',' as decimal separator. But that's what they did. And so did Apple more years ago by the way, even resulting in a calculator that couldn't be used anymore with the numeric keypad.

Anyway, found a guy working on keyboard layout stuff at Microsoft through LinkedIn as the other support channels were non-responsive. Unfortunately he just confirmed the change if I remember correctly. But at least we knew what was coming.