source: http://www.securityfocus.com/bid/6664/info

A vulnerability has been discovered in WinRAR. The problem occurs when the affected application opens an archive containing a file with an overly long file extension. 

It has been reported that it is possible for an attacker to exploit this issue to run arbitrary instructions. Commands executed in this manner would be run with the privileges of the vulnerable program.

https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/bin-sploits/22193.zip