If you have the original files for a DOS-based game to hand, then you can give DOSBOX a try yourself without buying the game a second time. For some older DOS-based games, GOG includes DOSBOX, a DOS emulator that runs older games on Windows 10, alongside the game files. GOG is a gaming marketplace that allows you to buy older games without resorting to piracy, where suspicious files from dodgy-looking websites can often bring nasty surprises.