Windows 1.0 Alpha Release

Windows 1.0 Alpha Release is a pre-release build of Windows 1.0. Although visually similar to Development Release #5, it features support for running DOS applications under Windows, a monochrome EGA display driver, as well as stability and API improvements. It's also the last known build to include the source code of sample applications, as the May Beta moved them to a separate package. 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.

Running COMMAND.COM under Windows
To be able to run  in a window under Windows, you must add the line   to the   section of. Without this line,  will, depending on the DOS version used, either hang at a black screen, or it will run in fullscreen and will hang when you try to return to Windows.

Earlier compiles
In 2019-04, an alleged screenshot of a 1984-12-28 compile of the Alpha Release has surfaced on BetaArchive. This has later been revealed to be a taken from a private video of what is claimed to be another earlier compile of the release, which purportedly came on 5 disks. So far, no proof has been provided for the genuineness of either compile.