Load Extra.DAT page In a major malware outbreak, you must load an Extra.DAT file to protect client systems until the next scheduled content update. ATP supports using only one Extra.DAT file at a time. In a situation where you need both a negative Extra.DAT file and a positive Extra.DAT file for Threat Prevention, you can request a combined file from McAfee Labs. Options Option Definition Browse Navigates to the location where you downloaded the Extra.DAT file. Apply Applies the new Extra.DAT file to the system.