Ubisoft does not distribute Far Cry 3 as .7z.001 files. If you purchase the game from Steam, Epic Games Store, or Ubisoft Connect, you receive encrypted .cab files or direct downloads. The .7z.001 structure indicates a scene release or a user repack (e.g., from groups like FitGirl, RG Mechanics, or BlackBox).
If 7-Zip throws a "Data error" or "CRC failed": Far Cry 3 Data 7z 001 Bin Download