Right-click the file -> 7-Zip -> Extract to "Banks/" .
It’s free, open-source, and the native tool for this format. Banks.7z
💡 If you see .bnk files after extracting, you will need a specialized tool like Ravioli Game Tools or vgmstream to actually play or convert the audio. To help you further, could you tell me: Where did you download the file? What is the approximate size of the archive? Right-click the file -> 7-Zip -> Extract to "Banks/"
Depending on where you found it, the contents usually fall into three categories: Banks.7z