What are UserData records?
UserData records are very similar to cookies. Just like the cookies they are used by some Web sites to store information about you on your computer and are privacy threat because they can contain sensitive information like your name and password for web mailboxes, password-protected sites, etc. The primary difference between cookies and UserData records is that the stored information in UserData records can be much larger (up to 128 KB per record). UserData records are stored in yet another Index.dat file in a hidden Windows directory. Only Internet Explorer 5 and later support UserData records. Mil Shield cleans both cookies and UserData records.