The hires_pistolpack.zip file you have requested: Call of Pripyat / Skins / Hi-Res Pistol Pack - 5.37mb 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:
Here are some new High-Res reskins of some of the pistols and guns in the game. See the readme for full details.