(Highly Recommended): Free, open-source, and supports almost every archive format.
: If you didn't specifically request or download this file from a trusted site, do not open it. Randomly named .rar files are often used to distribute Trojans. DWQGVAL rar
If you can tell me or what it is supposed to contain (e.g., a game mod, a work document, or a driver), I can give you more specific advice on whether it's safe to use. (Highly Recommended): Free