Hi, filenames depend on the sound manager used by the game. Samurai Shodown 2019 and Kof XV use WWiseAudio. This system uses .pck and .bnk as container files for the audio filetype, .wem. As you can see, bnk and wems use those numbers as filenames. The context or usable filename is generally in an outside file (forgot the extension). Samurai Shodown had them and that's why i could rename wems, assign them to characters and upload winquotes/sfx for everyone.
Kof XV deleted the reference files, every DLC team or DLC character added means a separate .pck. Inside this DLC pck there are bnk files for the character voice and sfx. Winquotes are separate unnamed wems. That's why at least DLC chars have battle voice and sfx.
In few words, without the reference files these are the filenames that you will get. The only semblance of organization i have are unnamed bnk containers.