Windows 1.0 Alpha Release

Windows 1.0 Alpha Build is a pre-release build of Windows 1.0. Although visually similar to Developer Release 5, it features support for running DOS applications under Windows, a monochrome EGA display driver and stability improvements. It's also the last known build to include the source code of sample applications. According to a comment in the  file, it was compiled on 1985-01-31.

Requirements
lists the hardware and software requirements during installation: The following equipment is required: o IBM XT or AT            o 512 K memory. o Floppy disk configured as DRIVE A:. o Hard disk configured as DRIVE C:. o IBM Color graphics card, Hercules Graphics Card, or EGA graphics card with monochrome monitor o External console connected to COM1: ( debugging ). o Microsoft mouse ( bus or serial ) or mouse with Microsoft compatible mouse driver (mouse.sys) The following software is required: o MS-DOS 2.x or 3.0
 * The  command will not work with this version of Windows, it has to be running on DOS 2.x or 3.00.