    # File lib/chef/provider/group/windows.rb, line 58
            def manage_group
              if @new_resource.append
                begin
                  #ERROR_MEMBER_IN_ALIAS if a member already exists in the group
                  @net_group.local_add_members(@new_resource.members)
                rescue
                  members = @new_resource.members + @current_resource.members
                  @net_group.local_set_members(members.uniq)
                end
              else
                @net_group.local_set_members(@new_resource.members)
              end
            end