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PortalProtect cannot scan some types of files such as those over 1-GB. Instead, PortalProtect takes other actions to prevent these files from threatening your SharePoint servers. The action it takes depends on the actions you have configured. The default action is Pass; other options include: Quarantine, Delete, and Rename.

Scan actions for unscannable files

During this scan...
PortalProtect executes this action...
Real-time
Block or Pass
Manual
Quarantine, Pass, Delete, or Rename
Scheduled
Quarantine, Pass, Delete, or Rename