: You cannot play an MP3 directly from part22 alone. All preceding parts (part01 through part21) must be present in the same folder to successfully reconstruct the original file.
These naming conventions were highly popular in the early 2000s for sharing "lossless" music formats (like FLAC) or massive MP3 bundles. Today, they are often found in: Lo-files out now https://bmth.co/lo-files - Facebook
A multi-part (or split) archive is a single large compressed file broken into smaller, manageable chunks. These are common on forums, cloud storage like Google Drive , or Usenet to bypass upload restrictions.
: A file ending in part22.rar indicates it is the 22nd segment of a much larger set.