Download and install JDownloader , a Java-based download manager designed to handle container files.
If Unlock DLC.zip is a zip file containing files meant to be placed into a game directory: Unlock DLC.zip
Open the Unlock DLC.dlc file using JDownloader. Download and install JDownloader , a Java-based download
Right-click Unlock DLC.zip and select "Extract All" or use a tool like 7-Zip/WinRAR to extract the contents to a folder. Download and install JDownloader