This is the native tool for this format. You can get a trial version from the official WinRAR website .
What (Windows, Mac, Android) are you using to open it? Do you know what is supposed to be inside the archive? WinRAR download free and support: WinRAR This is the native tool for this format
Before opening, run the file through an antivirus or upload it to VirusTotal to ensure it doesn't contain malware. do not open it
Large programs are often split or compressed into RAR files. This is the native tool for this format
If the archive contains a single file that looks like a document but ends in .exe , do not open it, as this is a common trick for spreading viruses. Common Uses for This File Type