said by Kilroy:I understand false positives, but on OS files is just a lack of testing prior to release and shouldn't be forgiven.
True, but it has happened to pretty much all of the AV companies at one time or another.
Aside from that, it is part of two major failures by Microsoft that have gone on for many years:
1) Failure to adequately protect OS files.
2) Allowing other programs and apps to mess with the Windows OS rather than being rigidly separate. MS was insane to go down that road to begin with.