I did a Google search of "Notice to Appear" and found this result. Turns out I was smart to not download and open the attachment. I ain't as dumb as I look!!

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A fake Notice to Appear at court claims you need to bring all documents and witnesses.
Attached zip file contains an exe virus or trojan horse.
Spoofs some law firm domain like jonesday.com, lw.com, mwe.com, or hoganlovells.com in headers.
This is an Asprox botnet email spreading Kuluoz / Dofoil malware.
Jones Day, Latham & Watkins, Hogan Lovells, and McDermott Will & Emery are real law firms, these emails are NOT from them.