: Indicates that this is the second segment of a multi-part RAR archive. Understanding Multi-Part Archives
: If you only have "part2," you cannot use it. You must find and download the matching "part1" from the same source to successfully extract the game. YCW-(RF)-NSwTcH-NSP-Ziperto.part2.rar
An article about specifically is not possible because this string is not a subject or a topic, but a compressed archive filename typically associated with unofficial game distributions. Based on the file naming convention, File Breakdown : Indicates that this is the second segment