I have the same Issue, I figured out that if you you set the modifier key to none it works, but if you are using a modifier key like ShiftKey it does not work. I don't know if it's fixable or if this has something to do with the microsoft library.
In case you still look for an answer: I just removed a few large soundfiles I don't need and copied EURO_A.wav because it is really small and renamed it to whatever files I deleted, because that file still has to exist and needs to have wav format.