Something free and quick to get the password of a RAR file?

Is there some kind of app that can unlock the password of a rar file?

look in win rar's page

RAR encryption does not contain backdoors, so the only possible way to
find a password is to test all possible character combinations

there's also a table in the page that express how many time can you spend to find the password, just remember if the password have more than 5 character you can lost your hope, a password with 5 characters it will take 5 days, with 6 characters 6 months with 7 characters 18 years and so on, I don't know if it's true but it's what the page says

Good luck, as stated, anything over a few characters will take decades. Try googling the name of the rar, and if you are lucky, you will find the password along with the file. A Guy

thanks will try all above