Again questions about Nokia 6600?

I have other questions! Please someone can answer me or help me?

1) I need a scientific calculator or more digit calculator for Nokia 6600 other than its original calculator. Can you give me the application name?

2) I want to edit the *.txt files that I sent from my computer with notepad of Nokia 6600 , but it only shows these files and I can't edit them! How can I manage to edit or add to these files of notepad that I sent from my desktop computer?

3) My Quickword v1.4 doesn't show *.DOC file list on my Nokia 6600 memory. What may the the problem?

4) I need an application that I can draw simple colour pictures. Is there any application?