Here's a more up to date manual
Here's a more up to date manual
I'm not sure if it's entirely relevant to your situation, but in my experience I could only get the code on my KRC4 to write to folders on the robots C: and D: drives. mounting the folders from the windows side works great, you just cannot access network locations from inside your code. I got around this by running a windows app that monitors the C:\blah folder for my files then moves them to the network location automatically.
You might make some progress by looking into the mount() command in the Cwrite / Swrite set of functions, I didn't manage to figure that one out yet myself though.
Good Luck!
On second thought, since you are trying to get files into the robot, Share a folder on the robot, and then mount that from the windows PC, rather than sharing a folder on the windows PC and mounting it from the robot.
This gets around the limitation of the robot code being unable to access network folders. you might need to create a user account on the robot controller and set the NTFS and share permissions of the folder to allow that user to access it. (which is what skyefire said...)