Windows 1.0/DR2

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Development Release #2 (DR2) demonstrated on the Tandy 2000 personal computer

Development Release #2 is an early pre-release build of Microsoft Windows 1.0, demonstrated on the Tandy 2000 personal computer.

For some reason, the Clipboard app has been removed, however, it was later re-added in the next build.


Just like the previous build, this build was launched from a file called DEMO.BAT and was intended to be run from a single floppy disk. This loaded a copy of Windows with several sample applications which could easily be loaded from there.

This build also predates NE and uses the .MOD extension as the main executable format.

The files here are as follows:

  • BOXES.MOD/BOXES.RES: Color demo
  • CALC.MOD/CALC.RES: Calculator application
  • COMMAND.COM: Microsoft MS-DOS command interpreter
  • CONFIG.BIN: System configuration file
  • CURSOR.MOD: Cursor routines
  • DEMO.BAT: Used to launch the Microsoft Windows demonstration
  • DISPLAY.MOD: Display driver file
  • 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 file
  • PUZZLE.MOD/PUZZLE.RES: Puzzle sample application
  • REVERSI.MOD/REVERSI.RES: Reversi sample application
  • SAMPLE.MOD/ SAMPLE.RES: Sample Application
  • SHELL.MOD/SHELL.RES: "DOS Window" shell application
  • TIMER.MOD: System timer driver file
  • WINDOWS.MOD/WINDOWS.RES: Microsoft Windows User component