Use 7z x #BEST_15.7z -o./output_directory . Unzip One: A free alternative app on the Microsoft Store.
Note: Ensure you are using the official 7-Zip, as fake versions can carry malware. To help you further, could you tell me:
To extract or "produce" the contents of a #BEST_15.7z file, you need to use 7-Zip software or a compatible utility.