That's not what I wrote. Operating systems today have files open nearly all the time. Some files you're working with, others help the OS; such as temp memory. When your email program is running, you have more than a single file open.
That has nothing to do with what I said. You can piss Linux off by doing hard shutdowns, too. For the same reasons I already stated. This isn't the days of DOS where hitting the power button usually didn't hurt anything.