Policy
Define the maximum size of downloaded files and attachments to be scanned
Windows 11 25H2
Policy overview
Key metadata and intent for this policy.
Supported OS tags: Windows10, Windows10RT, Windows11, Windows8, Windows81, WindowsRT, WindowsRT81, WindowsServer2012, WindowsServer2012R2, WindowsServer2016
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.
Registry values
How enabled and disabled states update the registry.
No explicit registry values are set for enabled or disabled states.
Policy elements
Inputs and configuration options exposed by this policy.
| Element | Type | Registry mapping | Constraints & behavior |
|---|---|---|---|
Define the maximum size of downloaded files and attachments to be scanned ID RealtimeProtection_IOAVMaxSize | decimal | HKLM\Software\Policies\Microsoft\Windows Defender\Real-Time Protection\IOAVMaxSize Type REG_DWORD | Range: 0 to 10000000 |
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