Fields
UNKNOWN = 0,
An unknown subsystem
NATIVE = 1,
Device drivers and native Windows processes
WINDOWS_GUI = 2,
The Windows graphical user interface (GUI) subsystem
WINDOWS_CUI = 3,
The Windows character subsystem
OS2_CUI = 5,
The OS/2 character subsystem
POSIX_CUI = 7,
The Posix character subsystem
NATIVE_WINDOWS = 8,
Native Win9x driver
WINDOWS_CE_GUI = 9,
Windows CE
EFI_APPLICATION = 10,
An Extensible Firmware Interface (EFI) application
EFI_BOOT_SERVICE_DRIVER = 11,
An EFI driver with boot services
EFI_RUNTIME_DRIVER = 12,
An EFI driver with run-time services
EFI_ROM = 13,
An EFI ROM image
XBOX = 14,
XBOX
WINDOWS_BOOT_APPLICATION = 16,
Windows boot application