SourceName=Microsoft Windows security auditing.
Security ID: BUILTIN\Administrators
Group Name: Administrators
Group Domain: Builtin
I am interested in Reporting on the above Event for only Windows Server Systems? Searching for the EventCode returns results for all Windows 10 systems as well. Can someone give me an example of how to cross reference those results with OS Type?
There is no such mechanism to identify os type with the logs. You may identify os type based on host if your organization is following some kind of naming convention to distinguish servers and endpoints.
or have csv file which contains hostname and os type of hosts which are sending logs. Then you can lookup os type based on host field.