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Help accessing a RK27xx device programmatically via USB

I have a PMP device that uses a Rockchip RK27xx chip.
Currently it his hooked up to my computer via a USB cable and I want to create a program in Windows (Vista) to access and interact with it. I want it to return a list of files stored on the device, and add (and possibly delete) new files to and from it. It's very important to me I get this done and that it's all done from within the program.
I can't simply access it as a Generic Storage Device, both because the firmware isn't letting me, and because of the uses I want to put the device too I can't allow myself to use that as an option.
So I'm trying to figure out the best way to communicate with it, on every level from accessing the USB data, to sending commands, to having file level access of the main storage of the device.

EDIT: I apologise for posting in the wrong form. If it could be moved to the "Support and How To" forum that would be very helpful.

Quote:

Originally Posted by knob (Post 272083)

Some members are reporting that this is not working on their player, I can only guess that the manufacturer is blocking this activity by using an unknown "tag" name, if this is the case there is nothing that can be done to expose the hidden partition, sorry to say.

Btw, this isnt quite correct. There is a universal way to unhide the hidden partition that involves sending a special USB/SCSI command to the device. You could write a tiny program using libusb that does this and as soon as you have access to the BASE.RKW its more or less easy to extract the correct filename for permanent unhiding.