View and delete alternate data stream files - Windows Freeware. Windows NT4, 200, XP, and 2003, when installed with the NTFS file system, support the creation of hidden "alternate data stream" files, but Windows Explorer cannot see them.

Stream Viewer adds a new tab to file Properties windows, allowing you to see and optionally delete hidden ADS files, which may pose a security risk and can be used to hide "malicious" files on a PC.