Here you will find only a brief WiFi transfer manual. Much more detailed manual with many screenshots and troubleshooting advices can be found here: www.goodreader.net/goodreader.html (visit this page from your computer and find "WiFi File Transfer" link on the left side of the page)

This technique connects your iPhone to your desktop computer as a network folder. It creates a network folder shortcut, which you can use later to connect.

Connecting your iPhone to Windows XP: