[BD]

Do yourself a favor and don't extract the contents of the pk3 file into the folder. This makes it difficult to remove the item, if you get tired of it. Instead, download the zip file and put the pk3 file unchanged into the folder. If you're already doing this, then I apologize. You weren't clear.

Anyway, no, you don't have to rename anything. Just put the pk3 in the folder and play.