This code is a class that lists the directory you pick and all the subdirectories inside of it. There is no limit of subdirectories. It is defined dynamically and reads files in directories and starts controlling after the 4. character from the end on the file name, and if there is ". d i r" it means that is a directory. This code use that algorithm to list all directories. And also it creates a tree and store all the information of all directories and files. You can use it whatever you want, it doesnt have to be devolopped.