Some old programs have issues when trying to adapt to modern operating system and hardware. Thereinto, some old games cannot be rendered in fullscreen due to either an intentional omission or incompatibility reasons, e.g.: games designed for 4:3 displays have black vertical bars on wide screens.

There are many reasons (such as reinstall Windows, Windows or hard drives break down, accidentally delete, forget to backup, or uninstall the games, etc.) can cause the archives/saves/profiles/sessions of games to be damaged or lost. In this case, you have to play them again, from the very beginning! Even a game comes with extremely high playability, players will strongly feel very boring. In particular, the storage path of gamesave files used by every game is not always the same one (but almost always under the C drive). This further makes players don't want to periodically or don't know how to backup these files manually.