If a compressed folder indicates it is unknown or damaged, downloading 7-Zip can often solve the issue.

Have you downloaded a file, perhaps named , and found yourself staring at a file extension you can't open?

Select > Extract Here (or "Extract to..." to choose a folder).

Before opening, right-click the extracted folder and select your antivirus software to scan for threats.

While RAR files are secure, they can contain viruses. It is highly recommended to use an antivirus to scan files before extraction.