The weight_mod.rar file you have requested: Modifications / Single Player / W to X Titles / Weight Mod - 9.6kb 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:
For more information on Stalker, visit Stalker.filefront.com This mod increases the weight limit to 2500. At 2250 you slow down, at 2500 you completely stop.