Add all files in a directory to a listbox / or a certain type.

**Update** I fixed a small problem. I founf while working on my Mp3 player. It wouldn't add any files in the current directory, say "mp3s" it would all all sub dirs... //Original\\My code adds a certain type of file to a listbox or all files. As an example I used .mp3 file extentions. This isn't like those gay ones that add just the files in the current directory, it adds all the files in Sub Directories too.