Hi,
actually you're not able to set passwords for encrypted files, because these files just belong to their "Encryptor", so there's no necessity for a password. If you're are not the Encryptor you can also view the file, but yu're not able to open it and not asked for a username/password to do so.
Creating user-accounts on my PC similar to those on the Win98-Clients won't work, cause we've got 16 PCs in our network and the other Users won't tell me their passwords (of course).