Together, they store localized voiceovers. soundenglish.dat/fat specifically holds English voice lines.
If your game is in another language, you can force the client to download the English files: Open your game launcher (Steam or Ubisoft). Together, they store localized voiceovers
Go to Games > Far Cry 3 > Properties > Local Files > Verify Files . Method 2: Force Language Update Together, they store localized voiceovers