We need more detail...
Quote: "1. How to open files"
What kind of files? Images? Models? Music?
Quote: "2. How to establish internet connection"
What exactly are you trying to connect to?
Quote: "3. How do you check how muck disk space you have left through db pro"
I'm not quite sure, I think I'll have to look for a solution to that...
Quote: "4. How to launch a exe that was compiled through db pro right after start up"
You will have to put the exe or the shortcut for the exe into a special folder executed when Windows starts up. You can get to this folder by navigating to
C:\Documents and Settings\All Users\Start Menu\Programs\Startup on Windows XP, or the similar folder.