C:\Program Files (x86)\Steam\steamapps\common\Call of Duty Modern Warfare 3 For repacks, right-click your game shortcut and select Open file location Backup Existing Files
Downloading language packs or repacks from unofficial sources carries significant security risks. Unofficial "cracks" or language patches can be flagged by antivirus software as malware. Furthermore, some community reports suggest that the 2011 PC version of MW3 may have security vulnerabilities in its multiplayer component, making it safer to play in solo modes like Campaign or Survival when using unofficial patches. You're looking for information on a specific game
You're looking for information on a specific game and its language pack. Here's what I found: The Technical Magic of Repacks
If you follow this guide, you’ll be storming Wall Street and rescuing the Russian President in perfect English within minutes. significantly reducing the initial download size.
the English files while stripping away other languages, significantly reducing the initial download size. The Technical Magic of Repacks