How do you unlock an encrypted winrar without the password?

Hi,
I was searching for a file over the net and I was able to download a rar file.
When I extracted it, the file was a WinRAR and encrypted.
Attached was a text file saying to go over the website and download the text file contacting the password.
When I tried to download it, I have to answer a survey and unfortunately, the survey is not available in my country.
I have tried rar unlocker but it doesn't work.
So how do you unlock an encrypted WinRAR when you don't have the password?
