From what I understand the new smart filter uses name and file size association to learn thus the reason for training over time it will associate a file of a certain size as a virus. It will also determine that a certain name is a virus. But if you mark a file that is marked as junk due to name association but not size it will learn over time that a file by that name is not necessarily junk but a file of a certain size and name is.

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A little common sense goes a long way

Later Grandpa