These files are often password-protected to bypass antivirus scans. You can use tools like PeaZip or WinRAR to view the Table of Contents (TOC) before extracting, provided the file names aren't also encrypted. Safety Recommendations
If you are looking for what might be inside or how to handle it: Echozy.pw.rar
Verify the reputation of the site or person that provided the link to Echozy.pw . These files are often password-protected to bypass antivirus