.7z files often achieve 30–70% smaller sizes than standard ZIP files. Security: These files support strong AES-256 encryption.
Based on your comment, here’s a quick overview of what that file type means: File: PineFalls2-Final-pc.7z ...
You'll need software like 7-Zip (Windows) or Keka (Mac) to open it. What are you trying to do with this file? File: PineFalls2-Final-pc.7z ...