Matthrix

Hello everyone ! I'm trying, unsuccessfully, to install correctly NAM (Network Addon Mod May 2010). I saw on several sites varying explanations blurred. I deleted the files as indicated, but it crashes the game once I put the name of my city ... Another question: once installed, where do you saved the .dat files for additional bridges, buildings ? In Plugins folder's Applications or Plugins folder's Documents ? Thank you for your help! PS : sorry for my bad english...i'm Français