Hacktool.Proxy in winrar sfx archive

Hello, for some reason NIS 2009 is detecting the winrar sfx archives as Hacktool.Proxy, and I'm sure they are not infected. It has happened in latest definition update. NIS has deleted file c:\program files\winrar\deafult.sfx

 

I think this is a false positive. I installed winrar 3.90 two weeks ago from main site.