Moved to VirusScan Enterprise as it seems a question about that.
I'm not sure I'm using the right terminology, but Explorer has various preview handlers that create thumbnails of each file. While Windows has built-in handlers for things like JPG, Adobe adds them for PDF, and Office adds them for its file types. My guess is that you'll want to remove/disable the appropriate handler.
So if you are reporting all accesses of .doc files, and a user opens a .doc file from a folder on the machine, that is EXPLORER.EXE accessing WORDFILE.DOC, with a READ action.