Some .rar files are configured as "SFX" (Self-Extracting) archives that can run hidden scripts (like .bat or .vbs files) the moment they are opened.
In the modding and "private server" communities for games like Legend of Mir or Mu Online , "shengyi" folders often contain data related to in-game shops or trading systems. shengyi.rar
Before opening, upload the file to VirusTotal . This service scans the file against over 70 different antivirus engines to check for hidden signatures. shengyi.rar