You can't do it without hacking the code behind the links, and even if you do that, you're going to have to be very careful and think through exactly when it should open a window and when it should not (that would be almost all of the time...)
I'm afraid John's suggestion of "let the user decide when they need a new window by making them use the right-click option" is the only non-coding option, and probably the right choice.
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