Sony mix walkman (wt13i) Keypad lock timing and file manager

I have few more question about my sony ericsson mix walkman phone (model WT13i), please help me to find answers for them.,,

My first question is where is file manager in this phone, I am not able to find any filemanger , is there any application available for this phone to install file manager ?

Second question is how to increase the keypad lock timing.?


and the third one is , the defualt time is displayed in empty screen, how can we avoid that.?

There is no file manage in this phone so you can't find it and I think its a java phone so there will not be any good application for file management either for it.

I don't know about keyboard lock timing..