Yes, and if they don't, introduce them to a 5-year-old. That doesn't mean they won't still have trouble working with filenames that differ only by case, and it

Yes, and if they don't, introduce them to a 5-year-old. That doesn't mean they won't still have trouble working with filenames that differ only by case, and it can still be pretty hard to explain why two characters that are visually similar are distinct to the computer. But the idea that letters that look different are different is not a hard one to understand. It's the default, and one that people have to actively unlearn.