Find GamerProfile.xml in your Documents\My Games\Far Cry 3 folder.
If you find the other methods too technical or want a simple tool to switch languages on the fly, there's a very user-friendly mod specifically made for this: english language pack for far cry 3 link
: Run your game launcher as an Administrator so it does not overwrite your registry edits upon boot. Find GamerProfile
(Contains game text, subtitles, and user interface strings) english language pack for far cry 3 link
Digital distribution platforms like Ubisoft Connect, Steam, and Epic Games Store often enforce regional locks. To prevent players from buying cheaper keys from other countries, publishers bundle specific regional languages into local versions.