This policy setting defines the maximum size (in kilobytes) of downloaded files and attachments that will be scanned.If you enable this setting downloaded files and attachments smaller than the size specified will be scanned.If you disable or do not configure this setting a default size will be applied.
Policy path:
Windows Components\Windows Defender\Real-time Protection
Scope:
Machine
Supported on:
At least Windows Server 2012 Windows 8 or Windows RT
Registry settings:
HKLM\Software\Policies\Microsoft\Windows Defender\Real-Time Protection!IOAVMaxSize; HKLM\Software\Policies\Microsoft\Windows Defender\Real-Time Protection!IOAVMaxSize
Filename:
WindowsDefender.admx