Anyone who received a copy of the MyDoom virus may have recognized that the bug came concealed inside a Zip file, which is a relatively new and evil way of concealing viruses and other bad things. I say evil, because zip files are commonly used to send larger documents or files via e-mail. Microsoft XP allows users to automatically unzip files, which people will often do without thinking. PC World’s article Zipped Files Can Zap Antivirus Apps has a good discussion on the issue.

The bottom line is, if you receive a zip file, run it through your anti-virus scanner first. If it’s from someone you don’t know, don’t open it. If you receive a zip file from someone you [do] know, verify he or she actually sent the file before attempting to open it.