Wine uses the Win32 API, which makes over 10,000 library calls, for centralizing compatability with Windows software. It can run many Direct X games, from the first Direct X, to Direct X 11. It can even run old Dos games, something that Windows has long time abandoned, although more recent versions of Wine have stated that Windows 1.x and 2.x compatability has been dropped, but older versions of Wine can still run them. Wine ensures good backwards compatability with Windows applications. Wine can mimic different Windows versions in order to ensure full compatability. Wine has native 64-bit compatability with many Windows software, as well. Wine has a few sister projects, the most popular one being PlayOnLinux, which is a GUI front end for Wine that makes it much easier to use Wine's advanced features. Wine does not only run on Linux, but is also implanted in the ReactOS project and has ever been a big part of development for Wine.