Bug#312552: Obsolete package
This package should be removed from debian. It is unusable.
This unrar use unrarlib from http://www.unrarlib.org
Unrar-free is very simple port to use these library.
If you see on download http://www.unrarlib.org/download.html
then you can see :
Attention: current version works only with RAR2.0 archives! Use WinRAR 2.9 or older (NOT WinRAR 3.x!) to create the archive!
But sarge, etch and sid have rar >3.x, so...it produce newer archve.
Now package is unmaintaned, but I think, that adoption of unrar-free is no sense. Upstream of unrarlib and unrar-free seems to be inactive (dead).