You also might want to check your Winrar preferences and make sure it is not associated with .ISO files.
Also, just because I like to play devils advocate, just because someone doesn't know how to unpack a .rar or burn an .iso doesn't mean it is illegal software (or warezies! as all the hip kids call them). My first few experiences with .rar/iso files were when my admin guy burned some projects I was working and the necessary software (all legal) so I could work on them at home as well.
Anyway, I didn't know my .rar from my .zip back then, but my ignorance wasn't due to leeching (woot, look at my lingo) (woot! look at my woot!) warzies during my free time.
Now, this isn't me defending anyone, just providing an alternate scenerio because I'm killing time at the office waiting for some stuff to finish printing. It is, more likely then not, someone with a torrent twinge that desperately needs the most recent crappy recording of V for Vendetta.