RAR files are not inherently dangerous. Their purpose, like a ZIP file, is to hold other files. But, be aware that files within a RAR file can be dangerous; malware has been known to spread via RAR files (as well as other archive file formats). It’s safe to open the RAR file and examine its contents. Before you extract a file, however, make sure it’s not malware, or have your antivirus software ready to check it. Check the file extensions within the RAR and see if they match what you expect. For example, if a file should be a video but you see that it ends in .exe, that’s a red flag that the file could be dangerous.