To extract or "produce" the contents of a #BEST_15.7z file, you need to use 7-Zip software or a compatible utility.
Install p7zip-full ( sudo apt-get install p7zip-full ) and use 7z x . #BEST_15.7z
What are you using (Windows 10/11, macOS, Linux)? To extract or "produce" the contents of a #BEST_15
Note: Ensure you are using the official 7-Zip, as fake versions can carry malware. To help you further, could you tell me: could you tell me: