Sorry, I should have explained this is indeed with Vanilla AutoCAD, this command (and a completely command line version of it) should be included in vanilla AutoCAD, but since it isn't, I am wondering if someone else has figured out a way to eliminate these AEC viruses and yes, I consider them a virus, as if you xRef a file with AEC objects into your drawing, your drawing now has AEC objects, even if you detach the xRef.