If the file is stored in a cloud service, you can often preview RAR archives in Google Drive without downloading them.
Many creators or websites bundle short "previews" or "trailers" into a single archive so users can see snippets of a video series (videos 11-15) before downloading or purchasing the full versions.
Because Windows 11 does not have built-in support for opening files natively, you will need a third-party tool to see what is inside:
Some media players or front-ends use separate RAR files to store thumbnail or preview data for their library. How to View the Contents
Some tools like the QuickLook extension (available in the Microsoft Store) allow you to peek into compressed folders by pressing the Spacebar .