These are often found in forum threads or file-sharing sites.
Multi-part archives (part01, part02, etc.) are used to split large files into smaller, more manageable pieces for downloading. Goth44mKn1gh7s.part01.rar
If you can tell me where you found this file or what type of content you are expecting from it, I might be able to offer more specific instructions. These are often found in forum threads or file-sharing sites