Coding a 'File Browser' for Blackberry Playbook in Adobe Flash Builder 4.6

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I am creating an app that allows users to import books from the books directory on the Playbook (when you plug it in to the computer). How do I code this? Is there a class I can use in Adobe Flash Builder to access the file directories?If you look at this image,http://cdn.crackberry.com/files/u10880/IMG_00000031.jpgyou can see that I want to make something very similar to this, where a user can import all of the books from the books folder.Thank you for all of your help!