However, TexStudio's default behavior is to open just ONE INSTANCE of the program and load all the files I open on that same instance.
If I want to open a new instance, I found a I nice solution here:
That way, everytime you open Texstudio from this link, you'll open a new instance.
However, if you want to open a new instance everytime you open a .tex file, apparently the best solution is to download this beautiful program:
which allows you to easily change the behavior of your default opening programs. For example:
(I learned this trick from here: http://superuser.com/questions/136133/how-do-i-set-advanced-file-associations-in-windows-7)
And that's all for today.