Here’s how to correctly the original patch.dat and patch.fat for Far Cry 3 (typically version 1.05 – the final official patch).
These files contain the latest official updates (most notably Patch 1.05 , the final major stable version). Importance for Modding: Most legacy mods, such as Ziggy’s Mod
: Right-click the game in your Steam Library (Properties > Local Files > Verify Integrity of Game Files) or Ubisoft Connect (Manage > Verify Files). This will automatically redownload the original patch.dat and patch.fat files.