CThe Arduino Due files you are after are located here on a Windows PC:\Users\name\AppData\Local\Arduino15\packages\arduino\hardware\sam\1.6.11\system\CMSIS\Device\ATMEL\sam3xa\include\component
C:\Users\name\AppData\Local\Arduino15\packages\arduino\hardware\sam\1.6.11\system\CMSIS\Device\ATMEL\sam3xa\include\component