Do you have (part02, part03, etc.) downloaded in the same folder to begin the extraction?
Many "MGOLD" series files are encrypted for privacy. You will need to locate the password from the original source where you found the download link. Safety First MGOLD-022-u.part01.rar
You might wonder why a creator wouldn't just upload one large file. There are several practical reasons for "multi-part" or "spanned" archives: Do you have (part02, part03, etc
Often used as a modifier, this can indicate a "unrated," "updated," or "ultra-high definition" version of the original "MGOLD-022" file. Do you have (part02