In multi-part archives, part2 is useless without part1 (and subsequent parts). Extraction tools must process part1 first to access the data spanning across files. Common Issues:
Use the "Repair" feature in WinRAR to attempt to fix CRC errors. If you can share: Where you found this file (website or context)? What error message you are seeing?
Ensure poj09.part1.rar is in the same directory as poj09.part2.rar .