Since there is no public information or "good review" for a file with this specific name, you should exercise extreme caution before opening it:

individually once they are unpacked, as some malware only becomes active after extraction.

: The name "Chk Ml" could be an abbreviation for "Check Mail," "Check Model," or "Check ML (Machine Learning)." If it came as part of a specific software patch or a modding community (like for Mobile Legends ), check the specific forum or site where you found it for user feedback. General Advice on RAR Files

: Before extracting the contents, upload the file to VirusTotal to check it against dozens of different antivirus engines.

Providing this context will help in identifying if it's a legitimate tool or a known threat.

A is a proprietary archive format developed by Eugene Roshal. To open it safely: Use a trusted extractor like WinRAR or 7-Zip .