No
Only one quiz will be added to the course
Yes
If the "File name" is a file, it is treated as the start of a chain
of Hot Potatoes quizzes and all quizzes in the chain will be added to the course
with identical settings.
If the "File name" is a folder, all Hot Potatoes quizzes in the folder
will be added to the course as a chain of quizzes with identical settings.