The free AIR Browser allows you to browse the directories, cut, copy, paste, rename and delete files and folders from your Blackberry Playbook. This is a very useful app due to the lack of a file manager currently on the device. The app runs in both landscape and portrait modes.
I found this to be a very useful app and would hightly recommend it to anyone that needs to edit their files...and at FREE, you can't beat the price!
To download this app, please go to Blackberry App World under Utilities.