You need the Apple Mobile Device USB driver in order to get file access. That's included in the iTunes install. You used to be able to download just the device driver without iTunes, but they don't really do that anymore.
Here's a link that says it has a download for it, but I'm not sure how legit it is:
http://www.driverscape.com/download/...ice-usb-driver
Safest bet, just install iTunes