You can add folders to trusted locations from "Office Button" / "Access Options" / "Trust Center" / "Trust Center Settings..." / "Trusted Locations"
The entries will be stored in the registry under: Access 2007: [HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Access\Security\Trust Locations] [HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Access\Security\Trust Locations\Location(n)]
For each trusted folder an entry with following keys will be created in the registry:
Path: Path of trusted location (ending with \“)
AllowSubfolders: Determines whether subfolders are trusted as well (0=No; 1=Yes).
Description: Free description.
Date: Date of last update (Format: DD.MM.YYYY hh:nn)
Microsoft TechNet:
Configure trusted locations and trusted publishers settings in the 2007 Office system Plan trusted locations and trusted publishers settings for the 2007 Office