Copy files to BlackBerry programmatically

I'm wondering if there's any command line tool for copying files (images, music) to BlackB开发者_运维知识库erry device. For installing software, there's a JavaLoader commandline tool, but it doesn't seem to support simple file copy. Any other alternatives? Perhaps it's accessible directly via file system?

When I plug my blackberry into my computer it offers to enable mass storage. Enabling this makes the BlackBerry filesystem available to the computer.