Turn of Windows Defender:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender]
"DisableAntiSpyware"=dword:00000001
On the other hand: Microsoft has already issued a fix: https://twitter.com/msftsecresponse/status/86173436019355238...
But still; the auto-unpack of archives leaves me wanting to just disable it completely.