Ensure you have all parts of the archive in the same folder.
: The .part1.rar extension indicates this is just the first segment of a larger compressed folder. You would need all subsequent parts (part2, part3, etc.) to successfully extract the data. sc24188-RF5.part1.rar
Use a program like or 7-Zip to "Extract" the contents. Ensure you have all parts of the archive in the same folder