[TYPO3] password protect files in fileadmin (PDF, ZIP) - for frontend users - how?

[Tomasz Chmielewski]

Now that I've learned how can I password-protect individual pages so 
that they are accessible by certain frontend users, I thought of 
something else.

How can I protect files in fileadmin, so that they are accessible by the 
frontend users I chose?

For example, I have such files, and would like them to be accessible by 
two users only:


user1:
http://server/fileadmin/protected/file.pdf

user2:
http://server/fileadmin/protected/archive.zip


Is it possible without .htaccess/.htpasswd, but instead by using the 
credentials frontend users already have?

The files don't have to be in "fileadmin" directory of course, if it's 
needed to implement it.

-- 
Tomasz Chmielewski
http://wpkg.org