The the_perfect_raindrop.zip file you have requested: Call of Pripyat / Skins / The Perfect Raindrop - 2.79kb 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 changes the rain texture in the game to something that looks a lot better.