How to add XML files to your Raspberry Pi
A quick guide showing you how to copy your sources.xml & advancedsettings.xml files to your Raspberry Pi. So you can connect your Raspberry Pi to your XBMC database/library. You cannot simply navigate the SD card that Raspbmc is installed on. Instead you must use a free program called WinSCP. Login to the Raspberry Pi and transfer over the files. Your Pi will have to be running and connected to your lan. You will also need the IP address of you Raspberry Pi.
Link to WinSCP (Free Program): http://winscp.net