Alright, I hope I can phrase this in a way that makes sense. If not, please comment and I'll try to make it clearer :)
Apps on iOS can expose their Documents directory to the user via iTunes. Interaction is very limited, and governed by iTunes.
Does iTunes provide a Windows API to access an App's Documents directory programmatically, for instance to store files there without user interaction?
Apparently, no public API exists for ordinary Win32 applications to access an iOS app's Documents directory. Bummer.