Oddly enough, Windows 10 Pro seems to leave my default browser alone most of the time (I do seem to recall it messing with it once, but I may be wrong), but I've had it attempt to switch my default media viewers away from VLC and Irfanview multiple times. Quite annoying.
That is because they still haven't fully adopted "new" file format association APIs (introduced with Windows 7).
Re:Firefox marketshare revisited
by errantblaze on Wednesday July 19, 2017 @06:34PM
(#14808598)
Likely related to the feeling that Windows 10 resets file associations is that Windows 10 changed the way this data is stored and restores the default value if the registry keys are manipulated directly.[1] As a side-note, I don't think any of the major updates have reset my browser choice, but I have gotten an irritating pop-up suggesting that I should try Edge.
[1] https://blogs.msdn.microsoft.com/oldnewthing/20170517-00/?p=...
I remember this unfortunately happening on Windows 7/8 upgrades to 10, but I've yet to encounter it on my personal machine in a Win 10 point release, at least as far as I can recall.