It doesn't work like that for FC2. It's much more complicated, although it has been done. I will try to update this mod with those files soon. It really increases the system demand, though.
Scubrah's patch for FC2 already has the improved view distance if you wanted to try it right now.
For FC3, if you're only tweaking the specific things mentioned in that comment, that will be the .xml file in documents/mygames/farcry3
BigTinz
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Far Cry Redux creator.