Files ending in .part01.rar found on various forums can sometimes be "repacks" or unofficial distributions.
Since Just Cause 3 is an older title often found on legacy sites, you might run into these common hurdles: Just.Cause.3.part01.rar
If you’ve found yourself staring at a file named , you are likely in the middle of a multi-part archive download. Just Cause 3 is a massive open-world game, and back in the day (and even now on certain forums), splitting these large installers into smaller "parts" was the standard way to share them. Files ending in