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• BIN/ various .DLLs for the Source engine
• HL2/ main mod directory; Source looks here first for content
  • BIN/ contains the mod client.dll and server.dll
  • CFG/ configuration files for misc items, ie maps, server configs
  • EXPRESSIONS/ face composer animations
  • MAPS/ contains the .BSPs or maps for the mod
    • GRAPHS/ node graph data automatically generated by Source
    • SOUNDCACHE/ sound cache data automatically generated by Source
  • MATERIALS/ .WAD replacement; home to all textures
    • MODELS/ materials for models
      • EDITOR/ materials for hammer
      • PLAYER/ materials for player models
      • WEAPONS/ materials for weapon models
        • P_MODELS/
        • V_MODELS/
        • W_MODELS/
  • MODELS/
    • PLAYER/ player models
    • WEAPON/ weapon models
  • RESOURCE/ required steam files
  • SCRIPTS/ other config files
  • SCENES/ data for managing scenes
  • SHADERS/ Pixel Shaders
  • SOUNDS/ audio for the mod
    • UI/ sound for main menu and other user interfaces
• MOD/ mod directory for Source modifications. layout should be identical to HL2/(see note)
• PLATFORM steam files
• RELISTS/ previous locations of files that have been moved in updates
• HL2.EXE the one and only

Note: The mod directory can be in the Halflife2 folder, but with steam and GCFs has allowed for the use of external folder Source MODs.