The new_item_descriptions_12.zip file you have requested: Shadow of Chernobyl / Mods / Singleplayer / Weapon and Item Descriptions - 45.63kb is not available. Perhaps try browsing all files for the game S.T.A.L.K.E.R. Shadow of Chernobyl and upload any files you want to share or are missing. This is the only information we could locate:
Decided to rename it since this includes more than just weapon strings, this mod replaces the strings that describe weapons and items in the game with ones that are more in depth and correct. Information was cribbed from Wikipedia, world-guns.ru, and various other sites.