I recommend to use iTunnel suit.
If you have been installed,

(1) make a folder
(2) copy follows
- iTunnel.exe
- iTunesMobileDevice.dll (it should be lastest version with iTunes 8.2)
- FileBrowser.exe (it's WinSCP)
(3) connect iPhone
- run : iTunnel.exe
- run : FileBrowser.exe or (WinSCP.exe)
(4) setup as
- Host name : 127.0.0.1
- User name : root
- Password : alpine
- Protocol - File protocol : SCP
* and click [Save...] button.

if you want to connect via WIFI, you can set IP address of iPhone on Host Name. In this case, you don't need to run iTunnel.exe before connect.

If you run 1st time, it will takes around 3-5 mins. You need to wait.