Recent versions of calibre will tell Windows what filetypes it can handle. This currently only happens on Win8, not earlier versions of Windows, specifically because Kovid has verified that Windows will NOT associate those filetypes by default, but will prompt you the first time to tell it which program you want to use going forward.
If Windows has done so anyway, it is not because calibre was designed to do so.
This does not happen to other people. If you can describe what non-standard behavior you might have performed that led to this, it is possible Kovid might be able to fix it from happening again. Regardless, lashing out here isn't going to help anyone.
Perhaps it is as DaltonST said?
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