On Oct 31, 2011, at 5:56 PM, Kyle Sluder wrote:

> Nah, there's something odd about the quarantine system in the current
> OS… download a file with Safari, double-click it, and it warns about
> opening an app from the Internet.

That’s actually appropriate depending on the file type — for instance, HTML 
files can run embedded JavaScripts with elevated permissions (a number of 
email-spread Trojans spread this way) and even TrueType fonts can be dangerous 
if there are bugs in the font renderer's hinting bytecode interpreter (Chrome 
had to go to some lengths to sandbox this.)

PNG files shouldn’t have any dangers, but my point is that it sounded like some 
of the files the OP downloaded weren’t actually PNG, or were perhaps corrupt 
enough to look like some other filetype to the OS.

—Jens_______________________________________________

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