If the security of the plain text file is a priority then you could provide network restricted read-only access to untrusted. Or move the files into a password-protected zip file.

Windows access rights are pretty easy to set up for any network administrator.

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Andrew Lockton
Chrysalis Design, Melbourne Australia

Many thanks for your reply. It is a useful suggestion.

However, I am curious: what if a hacker uses external programs to attack and obtain the password of the .zip file? Passwords can sometimes be quite weak and vulnerable to such attacks.