One of Apple’s stronger selling points has been its computers’ seeming imperviousness to malwares. Apple first introduced a feature “File Quarantine” in OS X 10.4 Tiger, carried over to OS X 10.5 Leopard, and now OS X 10.6 Snow Leopard offers an “enhanced” version of the feature, Apple confirmed. “Now File Quarantine pops up an alert the first time a potential piece of malware has been detected in Safari, iChat, or Mail with a warning that the file contains known malware and suggests that the user move it to the Trash,” Apple said. “For e.g., a bogus iWork that contained malware, is now automatically detected by File Quarantine. We see this as simply another example of the refinements users’ll find in Snow Leopard.” Apple creates the file signatures used by File Quarantine, and’ll be constantly updating signatures on its end, the company said.