Do you have (part1, part3, etc.) in the same folder?
If it's giving you an error, I can help you troubleshoot the extraction process. Sieihtusuh02EMNL10WB25WYE18.part2.rar
Use a tool like WinRAR , 7-Zip , or The Unarchiver to extract the files. Do you have (part1, part3, etc