Anyway, as a result all her .docx files got associated with microsoft office (yes, during the upgrade windows "forgot" her preference for libreoffice) and to add insult to injury, the files wouldn't even open, instead whenever she double clicked one of them she'd get an ad urging her to buy an office 365 subscription to allow her to see her own fucking files.
I'm done with Microsoft, forever. No matter what they do, I will never trust them again.