Dear Tom Connolly,
You can use Mary cooch comment if you are wanting to access it using the API.
But if you want the location of files in means of directory structure here it goes.
All your course related & site related data files are stored in
Moodledata(Or your custom data directory)/course_id/
Quiz
Where are the sound files kept? QUICK!
ການສົນທະນາຖືກລັອກ ດັ່ງນັ້ນ ທ່ານບໍ່ມາສາດຕອບກັບມັນ.