I've searched a little and didn't found anything about using File Roller with RAR archives on AMD64. The rar package required by File Roller in order to work is not available on AMD64 (correct me if I'm wrong; this howto would be useless). But it can be done with a little trick.
Install unrar-nonfree package:
$ sudo apt-get install unrar-nonfree
Make a symlink for unrar named rar:
$ cd /usr/bin/
$ sudo ln -s unrar rar
Hope this helps !
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