It was a zip file with password. It seems like rapidleech doesn't support that. I have already deleted it when you checked. No problem now. CPU load dropped to acceptable level. All good now.
CPU load doesnot matter on unzipping any file, i hope you are doing unzipping correctly.
Please create ticket for this kinds of problem!!
EDIT : just checked it , you are doing unzip while your file is rar, please do unrar (i just got it from ss you give me in pm)<_<