: You generally cannot use "Part 12" on its own. You need every preceding part (Part 1 through Part 11) and any subsequent parts for the file to be functional.
: Ensure all pieces are exactly the same size, as split archives usually distribute data in equal chunks, except for the very last piece.
: This is commonly shorthand for "Good Game" in gaming contexts, but it is also used by various niche software or modding groups as a prefix.
If you are trying to "provide a piece" or assemble this file, you must treat it as part of a larger set: