That is controlled by this bit in the subsystem field. https://learn.microsoft.com/en-us/windows/win32/debug/pe-format#optional-header-windows-specific-fields-i

That is controlled by this bit in the subsystem field. https://learn.microsoft.com/en-us/windows/win32/debug/pe-format#optional-header-windows-specific-fields-image-only https://learn.microsoft.com/en-us/windows/win32/debug/pe-for... Subsystems https://learn.microsoft.com/en-us/windows/win32/debug/pe-format#windows-subsystem https://learn.microsoft.com/en-us/windows/win32/debug/pe-for... There are also a few others usually NE for older win16 and LE for OS2 and other interesting win16 overlay types.