From admin prompt issue: Code: REG ADD "HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\MpEngine" /v MpEnablePus /t REG_DWORD /d 1 /f
This is too strict policy (even might be good policy for enterprise). It removed new utorrent and freefilesync setup files. Well, it is like some other AV programs now, with false positives
I've come to the same conclusion. Having this enabled (which I actually had forgotten that I had enabled, leading me to be somewhat puzzled by Defender's change in behavior) reminds me of using AV circa 10 years ago, when whatever I was using back then would false-positive me to death. One of the hallmarks of Defender was that it didn't do that. Maybe that's because it wasn't very good, but no matter. This option is off by default for good reason.
This Registry setting is re-enabled in recent Defender builds, so it appears to be the default now. The only new things in the Settings page for Defender relative to non-Insider builds are Enhanced notifications and Windows Defender Offline, so unless I'm missing it, if you don't want the feature you'll have to resort to the Registry.