Ensure you have ca221.part1.rar , ca221.part2.rar , and any subsequent parts (part3, etc.).
Move every file in the sequence into the same directory. ca221.part2.rar
💡 You cannot open part2 by itself; it is only a "middle chapter" of the data and requires part1 to function. Ensure you have ca221
If you are looking for the context behind these files, they often belong to: Ensure you have ca221.part1.rar