Trusted items are only available to select them if they are PUPs or potentially unwanted programs. You cannot not trust files willy nilly so they can be ignored by the real time scanner in the home edition.
Did you trust it recently (I see you said that). So what version of Mcafee are you running it ,the trusted file should be in the trusted listing in quarantined and trusted items. It should be in trusted items area. This is assuming you have 12.8 security centre.
No I assume you got your version from a Mcafee partner ie isp etc they run a few patches behind sometimes. Your Affid number I feel points that way as well.
12.1 should have the trust list visible if it does not best to call support they will sort out what is wrong.