Have you downloaded a file compressed in RAR without using WinRAR or other software that can read this format? RAR to ZIP Converter can help you solve this problem.
RAR to ZIP Converter does exactly what its name implies: transforms the RAR file to ZIP format. Select the RAR file to be converted, define the level of compression for the ZIP file (and a password to open the file, if necessary). Finally, click Convert and in a few moments, your new ZIP file will be available for use.