After IE7b2, mapped drives treated as Internet sources by Windows

After I installed IE7b2, shared folders mapped to local drives are no longer
treated as local (or even intranet) resources, but instead as Internet
resources. This becomes a problem when I attempt to open certain file types.
Opening an executable now pops up the typical "are you sure?" warning, which
is annoying but not a problem when compared to trying to open MS Access
databases.

When I try to open a .mdb from Windows Explorer I get a dialog asking if I'm
sure I want to open the file. Then, if I click the button that says "open" MS
Access starts up, but then instead of opening the database it displays the
following message:

"Microsoft Access cannot open this file.
This file is located outside your intranet or on an untrusted site.
Microsoft Access will not open the file due to potential security problems.
To open the file, copy it to your machine or an accessible network location."

If I open a .mdb using the UNC share instead of the mapped drive neither
Windows nor MS Access complain. Other systems on the network that have the
same setup but that have not been updated to IE7b2 do not appear to have this
problem.

Has this problem been noted by the developers and will it be addressed in
the next update?

Thanks for any information.
Brian Sweeney