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> do you know how many apps actually assume you have access to say, C:\?
Or that it even exists... One of the most annoying problems when I had windows installed on an extended partition :)

By that theory it's the OS's fault that you can delete the entire thing, ie "rm -rf /" on Linux.

> But all virii exploit a bug in the OS
That's a huge stereotype. I'd say very, very few exploit...