I avoid any proprietary data compression software because they tend to try to lock you in their own file formats. Not just WinRAR, I've seen such attempts at le

I avoid any proprietary data compression software because they tend to try to lock you in their own file formats. Not just WinRAR, I've seen such attempts at least twice just in my own country (South Korea). I don't want to take a risk that I can't (freely) open my own archive later; I'm aware the risk would be much smaller for WinRAR, but that's still unacceptable for me.