would this happen to be an appropriate place to ask about windows 10 deployments and Adobe as the default PDF app. We are setting it and as soon as explorer sees a pdf file or you try to open one, we get an error that Edge is now the default app.
I believe this is a bug with Windows 10 1607 and up. It wasn't fixed in 1703 yet so maybe a future feature update will finally fix it. You can have the user set it manually though.