This happens when language files are corrupted during extraction. Delete the newly added language files, temporarily disable your antivirus software completely, redownload the pack, and extract it again.
: If the game crashes after changing the language, it is likely missing the actual English audio/text assets. You will need to find a "Language Pack" download specifically for your repack version.
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Save files are typically stored in the players or players2 folder within the game root. Copy this folder to a safe location before modifying any game directories. Follow Up Guidelines
Only download language packs directly from the official thread or site of the repacker you used. This happens when language files are corrupted during
Call of Duty: Modern Warfare 3 English Language Pack Repack: The Ultimate Guide
If prompted by Windows to overwrite existing files, select This ensures the corrupted or foreign language headers are replaced by the English variants. Editing the Configuration Registry You will need to find a "Language Pack"
Sometimes, copy-pasting the files is not enough because the game engine is still instructed to look for a different language. You must manually force the game to recognize English. Navigate to your MW3 root folder. Look for a file named localization.txt . Open it with Notepad.
Check your repack source for a "Campaign Audio" add-on. Repackers often separate campaign audio from multiplayer audio to optimize sizes. Safety and Security Tips