Because mod files are community-created, only download BLC.7z from reputable sites like GitHub or Nexus Mods to avoid malware.

If this is for Borderlands 2 or The Pre-Sequel , it is highly recommended to import these files into BLCMM rather than executing them manually, as manual execution can break game patches. Download - 7-Zip

You can use tools like The Unarchiver or the Keka app to extract 7z files.