Password Protected files on Win XP

I am running XP SP2. I recently ran a virus scan with Kaspersky virus
checker.

It did not find any viruses on my C drive but it found 459 "Password
Protected Files".

Why would there be any such files on my computer? I am the only one who is
using it and I never use passwords.

Thanks for any enlightenment.

--
Walter
www.rationality.net
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