Sharing a MDB file on a Windows 2000 Server network

Hello everybody,
I have a little Access application that is composed by two MDB files.
I have stored the tables in the first MDB file, and the other objects
(forms, reports, queries, etc.) in the second.
I'm trying to share the back-end file (the one with the tables) in a
Windows 2000 Server network.
I have created an apposite folder, I have shared it and I have set up
all the sharing options.

When I try to open the MDB file, or to link its tables from the
front-end MDB file, I get a strange "Impossible to

open the file" error. It says that "the file is external to the
Intranet network or in another reliable location"

(I'm translating from Italian language, so the words can be different
in the English version of Access).

Can somebody help me in solving this problem?

Many thanks in advance, all the best.
Marco (Italy)