The stm32f37x.h and system_stm32f37x.h files are from stsw-stm32115.zip, 
the folder:

	STM32F37x_DSP_StdPeriph_Lib_V1.0.0/Libraries/CMSIS/Device/ST/STM32F37x/Include
	
The cmsis_device.h is added for convenience.