Can a tFileUnarchive component extract the RAR file type?
No. According to the tFileUnarchive documentation, the component supports only the following formats: *.tar.gz, *.tgz, *.tar, *.gz, *.zip.
RAR is a proprietary format and is not supported. You can use a tSystem component to call the unrar executable, if it is installed on the machine where the Job is running.