Windows 1.0 Alpha Release

Windows 1.0 Alpha Build is a pre-release build of Windows 1.0. This build is very similar to Developer Release 5, and was 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.

Easter Eggs
In FONTTEST.C, there is a funny quote:
 * 1) define Alphabet (LPSTR)"Jackdaws love my big sphinx of quartz. ABCDEFGHIjKLMOPQRSTUVWXYZ"

Said sentence, interestingly, uses every letter of the alphabet.