Generic filenames like "File020.rar" are frequently used by to hide the true nature of a file. If you received this file as an email attachment or downloaded it from an untrusted website: Do not open it without scanning it first.
If you weren't expecting a 20-part download or a data recovery file, it is safer to delete it.
Knowing the source (e.g., a specific website, an old hard drive, or an email) would help me give you more specific information.
Because this filename is used across various platforms, it could mean one of the following: 1. A Multi-Part Archive
You might see files labeled File.part01.rar , File.part02.rar , etc.
"File020.rar" would be the 20th segment of a larger file. You usually need all parts (01 through 20+) in the same folder to extract the final content using a program like WinRAR or 7-Zip . 2. Digital Forensics or Data Recovery