SonyEricsson Internal Filesystem

Hello and nice to meet you all!! I'm here for telling you that there is a secret directory on the all of SonyEricsson phone models (K300, K500i, K508i, K700, K700c, K700i, K608i, K610i, K800i, W300i, W800i, W500i, W810i, R600i, T610i, Z600i, Z300i, Z530i, Z610, Z510i, Z310i, Z530, Z610i, Z800i, etc.) That couldn't be detected even using MobyExplorer and MyPhoneExplorer. The directory is file:///tpa/preset/...

Nah, in that directory, you can edit the Internal File system such as editing sms confirmation sound, sms limit, font interface, changing camera shutter sound, using flash theme, change resolution and much more.
The problem is, I can't reach that folder although I know it. I know it from the .html file that stored in rss reader. The source told me that one of the image used the link is file:///tpa/preset/system/wap/rss/expandcollapse.png that when I tried to access the location, I failed. So, can anyone here give me the walkthrough for accessing file:///tpa/preset/... Without flashing or formatting filesystem?

Thank you for the advance. I will help for solving your problem too. Thanks