How to open a RAR with unknown password or reset your lost RAR password?

Published: 16th August 2010
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Someone sent me a .rar file and I can't open it, because it has a password. What are .rar files? How to open it?

RAR is a file format for data compression, similar to ZIP files. RAR stands for Roshal Archive; the format is named after its creator, Eugene Roshal.

A quick overview of file compression

File compression is a method of wrapping up one or more files into a single package that is often times smaller than the original(s). For example, say you wanted to e-mail a folder full of files to your friend. Instead of attaching the entire folder and all its multiple files to your e-mail message, you could compress the folder into one archive file and send that to your friend. You'll send the e-mail faster and your friend will download it quicker because the compressed archive is smaller than all of its contents in their original form. You can also be sure that your friend receives all of the files intended for him, because there's just one compressed file instead of many different files.

How to create and open .RAR files

In order to create (compress) and open (decompress) .RAR files, you need special software that understands the .RAR format. There are many software packages that can decompress .RAR files, but only the original WinRAR program can both compress and decompress with the .RAR format.

WinRAR download and support

WinRAR is shareware, meaning that you may use it for a short trial period before having to pay a fee to continue.

Creating .RAR files with WinRAR

Encoding .RAR files refers to the procedure for creating a .RAR archive. WinRAR integrates itself directly into Windows when you install it, so creating a .RAR archive out of any selection of files or folders is as easy as right-clicking. Simply right-click on the whatever you want to compress as a .RAR file, and you'll see WinRAR's options in the context menu that appears.

Here, we have right clicked on a folder named "Test Folder", and chosen to create a .RAR archive of that folder and its contents, called Test Folder.rar.

Opening .RAR files with WinRAR

If the RAR file with an unknown password, you may use a software to remove password.

Now the most popular one is called " RAR Password Recovery 5.0"

recovers passwords for RAR archives created with WinRAR, RAR or any other RAR-compatible software. Forgetting a password for an archive created long time ago is a common annoyance. RAR Password Recovery helps you to get your data back. Advanced dictionary attack, brute-force attack, and advanced brute-force with mask attack are used to recover the password. This software is easy to install and easy to use. All you need to do to recover your password is just to drag and drop your file to the program window. Dictionary attack supports 'mistypes' and additional user dictionaries.

More Info

If you'd like more information about the .RAR file format, visit my blog:

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