All adjunct classes at my alma mater have been cancelled as a cost-savings measure. I've been teaching classes there online since 2006, and have three well-developed online Bb courses. I've exported my classes for future use, but I do not prefer to import them to Canvas (in use at my current University) as it's unbelievably messy and not everything successfully imports anyway. I will still want to be able to extract materials from these courses from time to time. What is my option, since you can't simply unzip these exported files?