You cannot open or extract part 12 by itself; you must have all parts present to rebuild the original file.
: Ensure you have every numbered part (e.g., part01.rar through part12.rar and beyond) in the same folder . Final.Fantasy.XIII.part12.rar
If you are actually looking for a guide to of the game (Eden), here are key strategies from expert walkthroughs on IGN and GameFAQs : You cannot open or extract part 12 by
: Windows' default zip tool cannot handle multi-part archives. Use software like WinRAR , 7-Zip , or The Unarchiver for Mac. " you are missing a file.
: If part 12 is the last one you have but the program asks for "part 13," you are missing a file.