Knowing the will help me narrow down if this is a legitimate system file or something you should delete immediately.
Compressed files ( .rar ) with cryptic numeric names are frequently used to distribute malware or pirated content . 220418012468 rar
did you find the filename? (e.g., a specific website, an email, or a hard drive) What is the file size ? Are you trying to open it or just identify its origin ? Knowing the will help me narrow down if