The first computer version of the game is believed to have been created by Paul Alfille in 1978 for the PLATO system. Microsoft developer Jim Horne, who learned the game from the PLATO system, implemented a version with color graphics for Windows. It was first included with Win32s as an application that enabled the testing of the 32-bit thunking layer to ensure that it was installed properly. It was later included in Microsoft Entertainment Pack Volume 2 and later the Best Of Microsoft Entertainment Pack. However, FreeCell remained relatively obscure until it was released as part of Windows 95. In Windows XP, FreeCell was extended to support a total of 1 million card deals.