Location of Arduino ARM Hardware Library

I find the source for various hardware functions such as analogWrite for Arduino AVR (e.g., Uno) in C:\Program Files (x86)\Arduino\hardware\arduino\avr. What is the analogous location for Arduino ARM (e.g., Due)? "avr" is the only folder in C:\Program Files (x86)\Arduino\hardware\arduino.

Arduinio 1.6.7 has the AVR and ARM board options available and I successfully use my Uno and Due boards.

Stuff installed by board manager is in

C:\Users(your username)\AppData\Local\Arduino15\packages

Note appdata is a hidden folder.

Thanks for leading me to the files! Windows 10's search defaults made it ignore AppData's contents.