This is a Computer Group which contains all the computers that are discovered as a part of other Computer Groups defined in ManagementPack: SMSMSE_7.5_SCOM
<ClassType ID="UINameSpace75e2dc6b25ec4654b8190911956d03fa.Group" Accessibility="Public" Abstract="false" Base="MicrosoftSystemCenterInstanceGroupLibrary6172210!Microsoft.SystemCenter.InstanceGroup" Hosted="false" Singleton="true"/>