: EPUB files are primarily used for eBooks and not typically associated with video game language packs. Language packs for games like "Far Cry 3" are usually integrated into the game itself or provided as downloadable content (DLC) through the game's platform (like Uplay for Ubisoft games).
Contrary to popular belief, this isn't malice. It's regional pricing. A copy of Far Cry 3 sold in Brazil or Poland is 60% cheaper than a US copy. To prevent "grey market" reselling (buying cheap in Poland, activating in the USA), Ubisoft stripped the English files out of those specific digital builds. If you bought a key from G2A, Kinguin, or a Russian reseller for $5, you likely got the "RU" build. Far Cry 3 English Language Pack.epub
Sometimes copying files isn't enough. The game still thinks you are in Russia/Germany/etc. You must edit the Windows Registry. : EPUB files are primarily used for eBooks
Would you like step-by-step screenshots for changing language in Steam or Ubisoft Connect instead? It's regional pricing
for Far Cry 3 are delivered via:
in a specific version of the game (e.g., Steam or Ubisoft Connect)?