...then people get used to the fact that they have to rename without thinking the attachments they recieve called file.zip.rename to file.zip and they blindly execute what is inside. The spammers will soon be sending file.zip.rename-me attachments.
The advice is crazy, it does nothing to stop the virus/trojan as the user is no more educated than before as how to test that the contents of the file are safe or how to ascertain if the executable is OK or not.
Detemining that the zip came from someone who is prepared to rename it and send it again ony confirms to the source that they have a willing victim in their sights, or that the email address has a real user at the other end.
This is not security, it is IT red tape, serving no useful purpose
