Do you have a where you found this file, or can you describe the context (e.g., a forum post or email) to help narrow down what it might be?
A widely recommended free tool. You can right-click the file and select "Open archive" to see the list of filenames inside without running them. ajb05368.rar
The original software for this format. It allows you to view the archive structure and read any included "readme" text files. Do you have a where you found this