Often includes a "recovery record" to fix the file if it gets slightly corrupted during download.

Below is a blog post template you can use to explain what this file is and how to handle it safely. What is 51853.rar? Everything You Need to Know

rar - ArchWiki

If the file is much smaller than expected (e.g., a "game" that is only 100KB), it may be a fake or malicious file.

The official tool for creating and managing RAR files.

You cannot open a RAR file with built-in Windows tools like you can with a ZIP file. You will need third-party software: