The tool can be used to find files that have alternate ADS streams attached. It only find those ADS entries that are of the user type "alternate", which is sometimes used by spyware, malware and viruses.
Important: if you let this tool scan your whole hard disk, this may take some time in which it may even appear frozen (remember, for each file on your NTFS hard disk, there are usually at least 3 hidden legit ADS streams). Please be patient, it will continue.