Do you have the of this archive, or are you trying to repair a broken download?
: Ensure you have part1 through the final numbered part saved in one location. Don't Know What It This.part3.rar
: Right-click on Part 1 (not Part 3) and select "Extract Here." The software will automatically pull data from part3.rar when it reaches that point in the sequence. Do you have the of this archive, or
: Because it is the third part, it likely contains the middle section of a large file (like a high-definition video, a software installer, or a disk image) that was too big to be shared as a single unit. a software installer