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.

File Size and OS Limitation

Engine Name

File Size Limitation

OS Limitations


900 MB



4 GB



2 GB



2 GB

Only supported on Windows Server versions

Windows Defender


Limited to Windows Server 2016 and 2019

Supported File type for AI engines

Engine Name

Supported File Type

CrowdStrike Falcon ML

Portable Executable (PE)
Mach object file (Mach-O)
Executable and Linkable Format (ELF)
CDF & OOXML based Microsoft Office files
Adobe File (PDF)

Webroot SMD

PE and JS embedded on PDF


Any windows file that contains a PE header. That would include the file format for Windows executables, object code, and DLLs in both 32-bit and 64-bit versions.

Additional Installed Services

Engine Name

Installed Applications


Spy Emergency (an icon will display on desktop)


Symantec Protection Engine

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 2020-12-25