Use 7-Zip or WinRAR to inspect the headers without fully extracting.
Because "MM_17.7z" is a generic naming convention, its contents depend entirely on where you sourced the file. Here is a report on the two most likely scenarios for this specific file: 1. Data Breach / Leak Archive (High Likelihood) MM_17.7z
In cybersecurity and "data hoarding" circles, files named with initials and numbers (like "MM" for "Mega Mix" or a specific company name) often represent database dumps. Use 7-Zip or WinRAR to inspect the headers