If you can tell me or what type of file you were expecting (e.g., a game, document, software), I might be able to help you find more information.
File names with this structure (long alphanumeric strings, ".partXX.rar") often indicate: Part 2 of a multi-part RAR archive file.
Because this file does not appear in public databases, it is highly recommended to scan the file with reputable antivirus software (such as Windows Defender, Malwarebytes, etc.) before opening or extracting it.