You can use file compression software such as WinRAR, 7-Zip , or The Unarchiver to extract the contents. You only need to open part01 to begin extracting the entire set.
If you are having trouble opening this file, could you tell me: What are you using to try and open it? What error message do you see? I can then provide specific steps to resolve the issue.
This is the first part ( part01 ) of a segmented RAR archive.