Why does my router "Threat Prevention" complain about zip file download from 72.21.81.240?

[MarkTiede]

Is the 72.12.81.240 a valid site to get Microsoft software downloads? I'm trying to determine if this is a false positive. The event shows part of the content as:Content-000000a0 44 69 73 70 6f 73 69 74 69 6f 6e 3a 20 61 74 74 Disposition:.att000000b0 61 63 68 6d 65 6e 74 3b 20 66 69 6c 65 6e 61 6d achment;.filenam000000c0 65 3d 4d 69 63 72 6f 73

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