: If part 12 is the last one you have but the program asks for "part 13," you are missing a file.
You cannot open or extract part 12 by itself; you must have all parts present to rebuild the original file. Final.Fantasy.XIII.part12.rar
: Windows' default zip tool cannot handle multi-part archives. Use software like WinRAR , 7-Zip , or The Unarchiver for Mac. : If part 12 is the last one
: Do not rename the files. They must have identical names except for the part numbers. Final.Fantasy.XIII.part12.rar