Microsoft Internet Explorer 4.01 SP1 Security Patch Update (Windows)

This issue can cause Outlook Express to crash when a user receives and opens an e-mail message with an attachment that has an extremely long filename. These very long filenames do not normally occur in mail or news messages, and must be intentionally created by someone with malicious intent. A skilled hacker could use this kind of malicious e-mail message to run harmful code on your computer.