Below is the updated list of operating system operands for SCCM 2012 R2, including Windows 10 for reference. The below exact OS names must be used when programming the SCCM application creation.

Windows/All_ARM_Windows_8.1
Windows/All_ARM_Windows_8.1_Client
Windows/All_ARM_Windows_8_Client
Windows/All_Embedded_Windows_XP
Windows/All_IA64_Windows_Server_2003_Non_R2
Windows/All_IA64_Windows_Server_2008
Windows/All_Windows_Client_Server
Windows/All_Windows_RT
Windows/All_x64_Windows_10_and_higher_Clients
Windows/All_x64_Windows_10_higher
Windows/All_x64_Windows_7_Client
Windows/All_x64_Windows_8.1
Windows/All_x64_Windows_8.1_and_higher_Clients
Windows/All_x64_Windows_8.1_Client
Windows/All_x64_Windows_8_and_higher_Client
Windows/All_x64_Windows_8_Client
Windows/All_x64_Windows_Embedded_8.1_Industry
Windows/All_x64_Windows_Embedded_8_Industry
Windows/All_x64_Windows_Embedded_8_Standard
Windows/All_x64_Windows_Server_2003_Non_R2
Windows/All_x64_Windows_Server_2003_R2
Windows/All_x64_Windows_Server_2008
Windows/All_x64_Windows_Server_2008_R2
Windows/All_x64_Windows_Server_2012_R2
Windows/All_x64_Windows_Server_2012_R2_and_higher
Windows/All_x64_Windows_Server_8
Windows/All_x64_Windows_Server_8_and_higher
Windows/All_x64_Windows_Vista
Windows/All_x64_Windows_XP_Professional
Windows/All_x86_Windows_10_and_higher_Clients
Windows/All_x86_Windows_10_higher
Windows/All_x86_Windows_2000
Windows/All_x86_Windows_7_Client
Windows/All_x86_Windows_8.1
Windows/All_x86_Windows_8.1_and_higher_Clients
Windows/All_x86_Windows_8.1_Client
Windows/All_x86_Windows_8_and_higher_Client
Windows/All_x86_Windows_8_Client
Windows/All_x86_Windows_Embedded_8.1_Industry
Windows/All_x86_Windows_Embedded_8_Industry
Windows/All_x86_Windows_Embedded_8_Standard
Windows/All_x86_Windows_Server_2003_Non_R2
Windows/All_x86_Windows_Server_2003_R2
Windows/All_x86_Windows_Server_2008
Windows/All_x86_Windows_Vista
Windows/All_x86_Windows_XP
Windows/IA64_Windows_Server_2003_SP1
Windows/IA64_Windows_Server_2003_SP2
Windows/IA64_Windows_Server_2008_original_release
Windows/IA64_Windows_Server_2008_SP2
Windows/x64_Embedded_Windows_7
Windows/x64_Windows_7_Client
Windows/x64_Windows_7_SP1
Windows/x64_Windows_Server_2003_R2_original_release_SP1
Windows/x64_Windows_Server_2003_R2_SP2
Windows/x64_Windows_Server_2003_SP1
Windows/x64_Windows_Server_2003_SP2
Windows/x64_Windows_Server_2008_Core
Windows/x64_Windows_Server_2008_original_release
Windows/x64_Windows_Server_2008_R2
Windows/x64_Windows_Server_2008_R2_Core
Windows/x64_Windows_Server_2008_R2_SP1
Windows/x64_Windows_Server_2008_R2_SP1_Core
Windows/x64_Windows_Server_2008_SP2
Windows/x64_Windows_Server_2008_SP2_Core
Windows/x64_Windows_Vista_Original_Release
Windows/x64_Windows_Vista_SP1
Windows/x64_Windows_Vista_SP2
Windows/x64_Windows_XP_Professional_SP1
Windows/x64_Windows_XP_Professional_SP2
Windows/x86_Embedded_Windows_7
Windows/x86_Windows_2000_SP4
Windows/x86_Windows_7_Client
Windows/x86_Windows_7_SP1
Windows/x86_Windows_Server_2003_R2_original_release_SP1
Windows/x86_Windows_Server_2003_R2_SP2
Windows/x86_Windows_Server_2003_SP1
Windows/x86_Windows_Server_2003_SP2
Windows/x86_Windows_Server_2008_Core
Windows/x86_Windows_Server_2008_original_release
Windows/x86_Windows_Server_2008_SP2
Windows/x86_Windows_Vista_Original_Release
Windows/x86_Windows_Vista_SP1
Windows/x86_Windows_Vista_SP2
Windows/x86_Windows_XP_Professional_Service_Pack_2
Windows/x86_Windows_XP_Professional_Service_Pack_3
WindowsMobile/All_Windows_Mobile
WindowsMobile/Windows_Mobile_6.1
WindowsMobile/Windows_Mobile_6.5
WindowsPhone/All_Windows_Phone
WindowsPhone/Windows_Phone_10_higher
WindowsPhone/Windows_Phone_8
WindowsPhone/Windows_Phone_8_1
WindowsPhone/Windows_Phone_8_1_Embedded