The file extension .7z.003 indicates that this is the of a split 7-Zip archive. To access the contents, you generally need:

If the archive is encrypted, the "paper" is the text string used to unlock it. Common Ways to Find the Password ("Paper")

Look for a small file with the same name as the archive (e.g., Berliner Cityboys.txt ) that may have been included in the download folder.

If you can provide the where you found this file, I can help you look for the extraction requirements.