In some sharing communities, a "paper" refers to a text file or image (often called a "proof" or "nfo") that contains: The for the RAR. The source of the file.
You cannot open .part02.rar by itself. You must have all parts (part01, part02, part03, etc.) in the same folder. S2ckb0yDODI2GB.part02.rar
If you are trying to "fix" or "complete" a set of archive parts where part02 might be missing or corrupted, you actually need a (Parchive). In some sharing communities, a "paper" refers to
If you are unable to open the archive, here is the most likely reality: In some sharing communities
Knowing the (e.g., a specific forum or file-sharing site) would help me identify if there is a known "paper" or password associated with that specific naming convention.