The "Part09" suffix indicates this is not a standalone file. It is part of a larger set (e.g., Part01 to Part10).
RAR is a proprietary format used for high-quality data compression and error correction. KIDERFB2 IC Part09 rar
To access the contents, you must have all parts of the archive present in the same folder. Extracting only Part09 will result in an error. Likely Content: "KIDERFB2 IC" The "Part09" suffix indicates this is not a standalone file