I use Nod32 v4 and just updated the signature database an hour ago. I saw it downloaded 1.7 megabytes worth of updates. But when I did a search for which files were updated. Only three files (em002_32, em009_32, m002_64) were modified. And of those files in total only 100kb was modified. Why is that. I'm just curious. When I look in the action-center of Nod32 4 under help/about I see only the virus signature databas has been updated. Nothing else. Isn't that strange?