If you were instead referring to a specific file size (101 megabytes) or a specific technical error code, please see the note at the bottom. If you’ve ever downloaded a large file from the internet or tried to email a folder full of photos, you’ve likely encountered a .rar file. But what exactly is it, and why is it different from a standard folder? What is a RAR File? RAR stands for R oshal AR chive. It is a proprietary archive file format that supports data compression, error recovery, and file spanning. It was developed by Eugene Roshal (hence the name) and is currently licensed by win.rar GmbH. Repack: Wondershareubackit