The visible_range_mod.rar file you have requested: Call of Pripyat / Mods / Visible range mod - 616.18kb is not available. Perhaps try browsing all files for the game S.T.A.L.K.E.R.: Call of Pripyat and upload any files you want to share or are missing. This is the only information we could locate:
This mod increases range of visibility 3 times larger without noticeable FPS impact (at least on the authors system). Far objects are out of focus, but he likes the effect, the overall picture looks much more rich than before, plus it's really helpful for better orientation.