Are there any limitations regarding the MetaDefender Core v4 scan engines?

Some of the custom engines have limitations in regard to OS compatibility and maximum file size allowed for scanning.

You can see these listed below:

Engine Name

File Size Limitation

OS Limitations


900 MB



2 GB




Only supported on Windows Server versions

Windows Defender


Limited to Windows Server 2016 and 2019

Note: This list is accurate for the latest packages of custom engines.

This article applies to MetaDefender Core v4
This article was last updated on 2019-11-12