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Welcome to the site!
When you say "go back to the previous screen", which program are you talking about? If you just want to close a window, tap on the X on the right hand corner of the screen. Note that by default, this only minimizes the program into the background unless you have a 3rd party utility installed.
File associations are typically added within a program. What files and what programs are you thinking of?
I'm not sure about your 75% battery problem; are you able to try a new battery? As for your screen dimming, you can change the settings under Settings - System tab - Power - Advanced.
And as for the Owners Roadmap, I'm not quite sure where it's gone to either...
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