Users of compression technology (.zip, .tar etc) usually consider opening an archive benign. However, even without opening any executables, there are ways to do malicious, virus-like damage with file extraction. Most archivers, here reviewed competitively, are affected by the nasty techniques described here, but I was delighted to see that WinZip, my archiver of choice, received an almost perfect safety record on this issue by the Neohapsis reviewers.