121.rar -

If you have encountered a file specifically named 121.rar from an unknown source:

Many aviation professionals use RAR files to store or share large sets of documents related to Federal Aviation Administration (FAA) Part 121 , which covers regularly scheduled commercial air carriers. These archives often contain training manuals, safety programs, or hazardous materials guidance. 121.rar

After extracting, verify the contents. Be wary of executable files like .exe or .bat hidden inside, as these are the primary way malware is delivered via archives. If you have encountered a file specifically named 121