Cbgyapasus: 7z

: Most specialized .7z archives include a README.txt or INSTALL.txt file inside. Open this first for specific setup instructions.

: Use 7-Zip (Windows) or Keka (macOS).

If this file is part of a specific project (like a university assignment, a custom ROM, or a localized game patch), the "CBG" prefix often stands for a specific organization or group.