The launcher is the modern standard for MW3 on PC. It includes an auto-downloader for zone files.
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If you are looking for specific files to fix a "Menu Content Not Available" or "Couldn't load image" error, these are the most sought-after: code_pre_gfx.ff : Often causes startup crashes if missing. : The core shared assets for the game. Localized folders : Files inside zone/english zone/spanish (depending on your language settings). 3. Community Sources (For Plutonium or Older Versions) If you are using the Plutonium project The launcher is the modern standard for MW3 on PC