Sony Ericsson Android X10 mini pro Bluetooth how work is.. need to download an apps from Android Market called Bluetooth File Transfer. 

1. create a gmail account and log in to Android Market
2. download an app called [ Bluetooth file transfer ]
3. Install
4. Use the download app for start pair and send received the files
5. Local Files ( your Android device ) Remote files ( the other bluetooth device )
6. after you pair at the Remote files, choose the files you want, and double click it, will be appear [ Download this file ], then enter target folder name: example (/sdcard/)
7. click ok. 
8. transfer complete, you're able to see the file is store is the target folder as you set just now. 

   p/s this is the Android phone, the bluetooth function is not same like normal bluetooth function, that is able to do more than received and send file, can remote control the other device once pair with your Sony Ericsson X10 mini pro.