If your mod uses a mod loader (like Mod Installer by E-Club ), it will likely rename your original files to patch_original.dat automatically. Check your directory.
Why are they named "patch"? In the Dunia Engine, the loading priority system works alphabetically and by name. When the game loads, it reads the base files first, but if it encounters a patch.dat file, it prioritizes the assets inside this file over the base assets. This allows developers (and modders) to fix bugs or add content without rewriting the entire 8GB game archive. You simply drop in a small file that says, "Use this texture instead of the old one." Far cry 3 original patch.dat patch.fat 72