File: Cos_ro2_dlc.rar ... -

: Always run a scan on .rar files from unknown sources using a tool like VirusTotal .

Look inside the extracted folder to see what kind of files you have: File: COS_RO2_DLC.rar ...

: Re-visit the page where you downloaded this; usually, the uploader provides a readme.txt inside the archive with specific instructions for their version. : Always run a scan on