|Build of Windows 1.0|
Windows 1.01 is the first retail release of Windows 1.0, released on November 20, 1985 and discontinued on December 31, 2001. According to Microsoft, Windows 1.01 is an "Operating Environment" designed to run on top of MS-DOS, rather than a standalone operating system. Additional applications were bundled with Windows, including Write (a word processor), Paint (a graphics drawing program), Reversi (a game), and various utilities (Clock, Calendar, Calculator among others).
Windows 1.01 initially retailed for $99 in the US. It is designed to run on MS-DOS 2.00 to 5.00. If it is loaded on any version of MS-DOS higher than 5.00 (without using
WIN100.BIN), it will crash on startup.