A few newbie questions

I'm new to modding with games, i've been around on the forums for a few days now, but I cannot really find any nifty tutorial for beginners. Now, I can read most of the xml's, though I do not know how to open or at least unpack files and where they are located. When I unpack the vpp's i can open Xtbl w/ notepad, but cannot open STR2_pc files. And let's say I want to edit the speed of the vtol, how and where should I edit it?

Thanks in advance!
 
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