hxzero 0 Light Poster

Okay so I have two rars that i need to extract into an iso, in APP+K.part001.rar and APP+K.part002.rar format. However, when I extract APP+K.part001.rar, thinking it should extract the BOTH of them into a single iso, it extracts only the first part into a folder with many small zips, each which have a rar as well as pieces of the program in them. How do I get this to work?