In the Revit.ini file, the settings in the [FileNotificationSuppression] section suppress a warning dialog when opening known foreign files.
Corresponds to a list of known foreign files suppressed from the Open - Foreign File warning dialog.
Type = string
Valid values: Revit file names with extensions, values separated by commas.
[FileNotificationSuppression] Filenames=D:\Library\Autodesk\Revit\Families\foreign_file.rfa,C:\Users\Projects\unknown_project.rvt