Here you can find out how to setup PowerArchiver to work with rar.exe and be able to compress files to RAR format. Keep in mind that PowerArchiver will always use its own unrar for extracting RAR archives, because it is up to 30% faster than official RAR version.

PowerArchiver requires console RAR to create RAR files. It needs no installation, and is fastest version RAR available. It does not matter if it is 32bit or 64bit release, but it is important that it is in English language.

You can download it here:http://www.rarlab.com/download.htm