Removing trusted vendors

While doing a search by file name I noticed explorer.exe was trying to connect to a remote host *!!) For me, at this point it’s no longer a trusted application. How do I clear the trusted vendor list?

Thanks in advance.

I had the IP address off on one digit. It was tying to connect to Microsoft. Why it would need to connect there when I want to search for a local file I don’t know. There must be a way to clear that list(I hope).