Ensure you have 001-050.part1.rar , 001-050.part2.rar , and so on. Use extraction software: Use a tool like WinRAR or 7-Zip .
Because this is "part2," you cannot open it alone. You need part1 (and any subsequent parts like part3) in the same folder to extract the contents. 001-050.part2.rar
Could you tell me or what subject these papers are supposed to cover? I can help you track down the missing parts or the original source if you're having trouble. Ensure you have 001-050