You will need to install mobile phone monitor available from the website.
http://www.sonyericsson.com Sorry I could'nt find a direct link for it. It's somewhere on there.
Then you need a program called Sendfile. Install this. Get it from here. http://www.christersson.org/www/default.asp When you've installed MPM and send file, plug in you phone to the cable. Start sendfile up and then select the file and click send. Hope this helps. You can search for "Mobile phone monitor" here on esato, after all this is the best resource for us owners