Reenc.7z

Since this filename is generic and often used in unofficial file-sharing circles, always ensure you are downloading from a trusted source and scan the file for malware before opening it. 7z file, or

Highly compressed versions of video games intended for faster downloading. reenc.7z

Movies or shows that have been compressed into a smaller size (e.g., converting a large 4K file to a smaller 1080p version) while trying to maintain quality. Since this filename is generic and often used