windows.h in freertos

Hi Gents  I have copied all the necesary filef for freertos (.h and .c ) to use it for one of my projects, when i compile it compiles all the files with no problems except one file which has the include <windows.h> file , I think  its in portmacro.h…
I have downloeaded the SDK from the net and i am stuck , I dont know wht to do next
any help is really appriciate it… many thanks….

windows.h in freertos

http://www.freertos.org/FAQ-how-to-use-the-FreeRTOS-support-forum.html