Windows 1.0/Development Release 2

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Development Release #2
Windows 1.0 DR2 - Desktop.png
Kernel version 1.0
CPU architecture x86 (16-bit)
Compile date June 1984

Development Release #2 is a pre-release build of the Microsoft Windows 1.0 operating system, compiled sometime in June 1984. Only the Tandy 2000 variant of this build is currently known to exist, however, a PC-compatible variant of this build would've been shipped as well.


This build, respectively its Tandy 2000 variant, was demonstrated at the Boston Computer Society meeting in June 1984.[1] Just like the previous, this build was launched from a file called DEMO.BAT, and was ran from a single 5,25" floppy disk.

The Clipboard application was not included in the demonstrated build. It is currently unknown why it was removed.

File list

File list (as seen in the DOS Window)

  • BOXES.MOD/BOXES.RES - Boxes application (color demo)
  • CALC.MOD/CALC.RES - Calculator application
  • COMMAND.COM - Microsoft MS-DOS command interpreter
  • CONFIG.BIN - The system configuration file
  • CURSOR.MOD - The Cursor Routines file
  • DEMO.BAT - A batch file used to launch the Microsoft Windows demonstration
  • DISPLAY.MOD - Display driver
  • FONT.RES - Font resources
  • GDI.MOD - GDI (Graphics Device Interface) system file
  • KERNEL.MOD - Microsoft Windows kernel system file
  • KEYBOARD.MOD - Keyboard system file
  • KEYNAMES.BIN - Input translation table lookup file
  • MB.EXE - Module boot
  • MOUSE.MOD - Mouse driver
  • PUZZLE.MOD/PUZZLE.RES - Puzzle application
  • REVERSI.MOD/REVERSI.RES - Reversi application
  • SAMPLE.MOD/ SAMPLE.RES - Sample application
  • SHELL.MOD/SHELL.RES - "DOS Window" shell application (later became MS-DOS Executive (MSDOS.EXE)
  • TIMER.MOD - System timer driver
  • WINDOWS.MOD/WINDOWS.RES - Microsoft Windows User component