Sbsp-bfbfr-nswtch-[base]-nsp-ziperto.part1.rar -

The "paper" you are likely looking for refers to the or the RAR password required to extract the files.

For files from that specific source, the password is almost always: Quick Tips for Extraction: Case Sensitivity: Make sure to type it in all lowercase. SBSP-BFBFR-NSwTcH-[BASE]-NSP-Ziperto.part1.rar

Ensure you have all parts (part1, part2, etc.) in the same folder before you start the extraction of part1. The "paper" you are likely looking for refers

Use a modern extraction tool like 7-Zip or WinRAR to avoid "Header Corrupt" errors. SBSP-BFBFR-NSwTcH-[BASE]-NSP-Ziperto.part1.rar