This is a spanning volume . Large files (like software installers, high-definition videos, or database backups) are often split into smaller "parts" to make them easier to upload, download, or store on limited-capacity drives.
It is a Roshal Archive (RAR) file, a proprietary format used for high-efficiency data compression. sc22692-rstv2356-part2-rar
You need the first part (likely named sc22692-rstv2356-part1.rar ) to start the extraction process. This is a spanning volume