The official software for this format. Ensure you are using version 7.13 or later to be protected against recent security flaws.
A newer "zero-day" vulnerability allows attackers to use path traversal to write malicious files to your Windows Startup folder. 4. How to Safely Open It 22848 rar
A popular, free, open-source alternative that can extract (but not create) RAR files. The official software for this format
If the file is very small (a few KBs) but claims to be a large game or program, it is likely a scam or a virus. 22848 rar
A RAR file is a "Roshal Archive," a proprietary format used to compress multiple files into a single, smaller container.