Access 2003 Workgroup Information File Question

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I have two secured Access 2003 databases in a folder on a shared network drive. I have one workgroup information file in that folder that both databases reference. I have no problem at all with either of these databases or with their security. All the security settings work as they should. My problem is that I want to secure another database on that shared drive, with the same users, but I want to put these users in different groups than they are in for the other workgroup information file. I tried creating a new workgroup information file and setting the users to different groups in it, but this changed their permissions to the other databases. Is there some way to do this? Can I set users to be in different groups in different workgroup information files? Will Access 2003 always set the permissions to the least restrictive for a user, even if those less resrictive permissions are in a different workgroup file? I would appreciate any help anyone could give me. I guess what my question boils down to is can I give a user different permissions for different databases and if so, how? Thanks alot for any help that you can give me.