If you have the files but they are not working, use the "Verify Integrity of Game Files" option in Steam or "Verify Files" in Ubisoft Connect to replace missing English audio/text files.
You may have encountered files labeled while searching for a way to change the voiceovers or text in your game to English. This specific file name is highly misleading and presents a serious digital security risk. Far Cry 3 English Language Pack.epub
If you are using Steam, right-click Far Cry 3 > Properties > Installed Files > Verify integrity of game files. Steam will realize you changed the files. If it "repairs" them back to Russian, you must disable automatic updates for that game. If you have the files but they are
Here's a direct answer: