Windows Developer Release 5 (known as DR5) is an alpha version of Windows 1.x.
There are sample application to demonstrate the "power" of windows.
- Graph & Chart application
- Font application
- Clock
- Puzzle game
- Reversi game
To install DR5 you will need PCem or an equal IBM AT/XT emulator. Also DR5 only run on MS-DOS up to Version 2.x.