This policy setting allows you specify a list of file types that should be excluded from scheduled custom and real-time scanning. File types should be added under the Options for this setting. Each entry must be listed as a name value pair where the name should be a string representation of the file type extension (such as "obj" or "lib"). The value is not used and it is recommended that this be set to 0.
Policy path:
Windows Components\Windows Defender\Exclusions
Scope:
Machine
Supported on:
At least Windows Server 2012 Windows 8 or Windows RT
Registry settings:
HKLM\Software\Policies\Microsoft\Windows Defender\Exclusions!Exclusions_Extensions; HKLM\Software\Policies\Microsoft\Windows Defender\Exclusions\Extensions
Filename:
WindowsDefender.admx