Max Payne lets you easily play user-made maps and content
        modifications, 'mods'. There are already dozens of exciting mods made by
        fans. Some mods might modify the original game to give Max new weapons,
        new skills or a new perspective. Others might introduce a completely new
        surroundings and characters.
        To find and download mods, please 
        visit some various Fan
        Sites (listed here).
        Both PC and Mac versions of Max Payne can use mod-files. After
        downloading a mod,  just place the file (modname.mpm) under Max
        Payne game folder. Start the game, and you can select the mod from the
        "Choose Customized Game" pop-up list in the startup screen. To
        enable original Max Payne again, just select "none" from the
        pop-up list. Have fun!
      
          Questions? Problems? Something to say? To discuss Max Payne, Max
          Payne editing, mods, technical issues or pretty much anything about
          Max Payne, have a look at 3D
          Realms forums, You will find several Max Payne sections, hundreds
          of topics and thousands of messages.