Import Registry entries
These entries affect the default settings on the Attachments screen of the Import Wizard when a Custom import is performed:
Attachments Exclude Empty Fields Registry entry
Specify that the Exclude empty fields from attachment search option on the Attachments screen of the Import Wizard is checked / unchecked by default.
Attachments Only Search Batch Registry entry
Specify that the Only search records imported in this batch option on the Attachments screen of the Import Wizard is checked / unchecked by default.