Some community resources bundle Arena 7 (Royal Arena) deck guides and strategy spreadsheets into archives for offline viewing.
If you don't have it, download the open-source 7-Zip utility . Arena.7z
In the chess community, .7z files like "Arena.7z" often contain opening books or engine configurations for the Arena Chess GUI , a popular free graphical user interface for chess engines. Some community resources bundle Arena 7 (Royal Arena)