Since this is a .part2.rar file, it cannot be opened on its own. You must have the corresponding .part1.rar file in the same folder for the extraction to work correctly.
Option 3: Descriptive (If this is for a Sony Head Unit update) Version: 1150f7 Type: Compressed RAR Archive sc22821-CSPAPv1150f7.part2.rar
Segmented file; ensure Part 1 is also present to avoid CRC errors. Since this is a
CSPAP Update v1150f7 (Part 2) Action: Download all parts into the same folder before extracting. Use WinRAR or 7-Zip to open Part 1; this part will be processed automatically during extraction. Since this is a .part2.rar file