If you have the or the exact site name where you saw this file mentioned, I can try to help you narrow down the source.
Do you remember the where you first encountered this file? SPECIAL1229_PACK1.part2.rar
This filename follows a standard naming convention for multi-part RAR archives, typically used on forums, Usenet (NZB), or file-sharing sites to distribute large collections of data. To find the specific "complete post" or the other parts of this set (like part1, part3, etc.), you should check the specific source where you found the first part, such as: If you have the or the exact site
There is no public information or specific "complete post" matching the filename currently indexed. typically used on forums
Many "Packs" with these naming styles originate from community-specific boards.