Download Insight and Compressed Files - NIS 2010.

Hi folks:

 

When I download a compressed file, i.e. RAR, ZIP, etc., there is no visual notification that the contents within the file are safe.

 

Is this considered to be normal operation? Some of the files which I download are nested within each other and I wonder "how deep" NIS 2010 can go to look for threats on a RT basis, or even via a single scan of the entire compressed file, as a whole.