Microsoft Windows 1.x, Development Release 5


General information
File format
  • Floppy Disc
Bootable No
Architecture 16-Bit
  • English

Install information
Full buildtag Development Release 5
BIOS date 01/11/1984
Product Key n/a


The earliest leaked build of Windows that is available.
This is already sometime in development and looks already a lot like the final product.

It installs via a batch file that must be run from the HDD, it includes basic applications like a Calculator, Clock and a game called Reversi.


MD5 Floppy 1: 93B92D7D7820118B7802621F975883AF
MD5 Floppy 2: 0C965620E24A458BDF0A6B2E8F6831C5
MD5 Floppy 3: A0A340BEE0C0B31975C04AA3333E25F5


This version of Windows needs special requirements or it doesn't install, specifically the Timer and Bus/Serial mouse, it isn't emulated/virtualized by Virtual PC or VMware.
The use of PCem v0.3 configured with a IBM XT at 16 MHz is recommended.

Once configured, boot the Machine with a MS-DOS 2.1 Bootdisk and format the HD.
Copy the install.bat to C:\ then run it and follow the instructions.

After the installation you can just start windows by typing MSWIN but after you have rebooted, the PATH is gone, to start it type: path C:\windows\bin and then go to C:\windows\test and run MSWIN.

If you recieve an error that say's that OpenAL32.dll is not installed on your system, download the file below and follow the instructions in the Readme file.

Screenshots (36)

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