Strings like "MM_19" frequently appear in encoded data within SEC EDGAR filings , though these are typically parts of larger text documents rather than standalone downloadable archives.
Are you trying to from this archive, or did you receive it as part of a software installation ? MM_19.7z
Run the file through an antivirus or VirusTotal to ensure it doesn't contain harmful scripts. Strings like "MM_19" frequently appear in encoded data