How do I restrict the visible files under the available files list?

I have a bunch of FileMaker files, each with its own specific users and security settings (examples: a single file for Ordering, a single file for Tracking Property, a single file for Customers to view the property they have checked out to them). All of the files share the pertinent information so there isn't any redundancy.

I want all of my different users to enter my FileMaker solution through a single FileMaker file that I've created just as a menu screen to all of the different files. From there, the users can select what they need to do (make an order, view property, etc), which will open a separate FileMaker file.

The problem: when a user opens FileMaker Pro and goes to open a remote file on the server, ALL of the open files are listed.

How do I allow the users to only see the menu file, but still be able to open the other files (via a button/script in the menu file)?

I am using Active Directory for user authentication.

Thanks,

Joni